diff --git a/app/assets/javascripts/old_design/admin_procedures_modal.js b/app/assets/javascripts/old_design/admin_procedures_modal.js
deleted file mode 100644
index 5a013cb53..000000000
--- a/app/assets/javascripts/old_design/admin_procedures_modal.js
+++ /dev/null
@@ -1,70 +0,0 @@
-/* globals $ */
-
-$(document).on('turbolinks:load', init_path_modal);
-
-var PROCEDURE_PATH_SELECTOR = 'input[data-autocomplete=path]';
-
-function init_path_modal() {
-  path_modal_action();
-  path_validation_action();
-  path_type_init();
-  path_validation($(PROCEDURE_PATH_SELECTOR));
-}
-
-function path_modal_action() {
-  $('#publish-modal').on('show.bs.modal', function(event) {
-    $('#publish-modal .modal-body .table .tr-content').hide();
-
-    var button = $(event.relatedTarget); // Button that triggered the modal
-    var modal_title = button.data('modal_title'); // Extract info from data-* attributes
-    var modal_index = button.data('modal_index'); // Extract info from data-* attributes
-
-    var modal = $(this);
-    modal.find('#publish-modal-title').html(modal_title);
-    $('#publish-modal .modal-body .table #' + modal_index).show();
-  });
-}
-
-function path_validation_action() {
-  $(PROCEDURE_PATH_SELECTOR).keyup(function(key) {
-    if (key.keyCode != 13) path_validation(this);
-  });
-}
-
-function togglePathMessage(valid, mine) {
-  $('#path-messages .message').hide();
-
-  if (valid === true && mine === true) {
-    $('#path_is_mine').show();
-  } else if (valid === true && mine === false) {
-    $('#path_is_not_mine').show();
-  } else if (valid === false && mine === null) {
-    $('#path_is_invalid').show();
-  }
-
-  if ((valid && mine === null) || mine === true)
-    $('#publish-modal #publish').removeAttr('disabled');
-  else $('#publish-modal #publish').attr('disabled', 'disabled');
-}
-
-function path_validation(el) {
-  var valid = validatePath($(el).val());
-  toggleErrorClass(el, valid);
-  togglePathMessage(valid, null);
-}
-
-function toggleErrorClass(node, boolean) {
-  if (boolean) $(node).removeClass('input-error');
-  else $(node).addClass('input-error');
-}
-
-function validatePath(path) {
-  var re = /^[a-z0-9_-]{3,50}$/;
-  return re.test(path);
-}
-
-function path_type_init() {
-  $(PROCEDURE_PATH_SELECTOR).on('autocomplete:select', function(event) {
-    togglePathMessage(true, event.detail['mine']);
-  });
-}
diff --git a/app/assets/stylesheets/admin_procedures_modal.scss b/app/assets/stylesheets/admin_procedures_modal.scss
deleted file mode 100644
index b6b2aa84e..000000000
--- a/app/assets/stylesheets/admin_procedures_modal.scss
+++ /dev/null
@@ -1,24 +0,0 @@
-.path-mine-false {
-  color: #FF0000;
-}
-
-#path-messages {
-  .message {
-    display: none;
-  }
-}
-
-#publish-modal {
-  .algolia-autocomplete {
-    width: 300px;
-  }
-
-  .aa-dropdown-menu {
-    width: 300px;
-  }
-
-  // Fix the input not being displayed on the same line than the text before
-  .aa-input {
-    vertical-align: initial !important;
-  }
-}
diff --git a/app/assets/stylesheets/application.scss b/app/assets/stylesheets/application.scss
index 5eec7e869..84ef7d75e 100644
--- a/app/assets/stylesheets/application.scss
+++ b/app/assets/stylesheets/application.scss
@@ -13,7 +13,6 @@
 // = require _card
 // = require _helpers
 // = require _turbolinks
-// = require admin_procedures_modal
 // = require admin_type_de_champ
 // = require carte
 // = require custom_mails
diff --git a/app/controllers/admin/procedures_controller.rb b/app/controllers/admin/procedures_controller.rb
index c2c061e75..05230f168 100644
--- a/app/controllers/admin/procedures_controller.rb
+++ b/app/controllers/admin/procedures_controller.rb
@@ -2,7 +2,7 @@ class Admin::ProceduresController < AdminController
   include SmartListing::Helper::ControllerExtensions
   helper SmartListing::Helper
 
-  before_action :retrieve_procedure, only: [:show, :edit, :delete_logo, :delete_deliberation, :delete_notice, :monavis, :update_monavis]
+  before_action :retrieve_procedure, only: [:show, :edit, :delete_logo, :delete_deliberation, :delete_notice, :monavis, :update_monavis, :publish_validate, :publish]
 
   def index
     if current_administrateur.procedures.count != 0
@@ -40,11 +40,16 @@ class Admin::ProceduresController < AdminController
   end
 
   def show
+    if @procedure.brouillon?
+      @procedure_lien = commencer_test_url(path: @procedure.path)
+    else
+      @procedure_lien = commencer_url(path: @procedure.path)
+    end
+    @procedure.path = @procedure.suggested_path(current_administrateur)
+    @current_administrateur = current_administrateur
   end
 
   def edit
-    @path = @procedure.path || @procedure.default_path
-    @availability = @procedure.path_availability(current_administrateur, @path)
   end
 
   def destroy
@@ -63,13 +68,10 @@ class Admin::ProceduresController < AdminController
 
   def new
     @procedure ||= Procedure.new(for_individual: true)
-    @availability = Procedure::PATH_AVAILABLE
   end
 
   def create
     @procedure = Procedure.new(procedure_params.merge(administrateurs: [current_administrateur]))
-    @path = @procedure.path
-    @availability = Procedure.path_availability(current_administrateur, @procedure.path)
 
     if !@procedure.save
       flash.now.alert = @procedure.errors.full_messages
@@ -87,10 +89,6 @@ class Admin::ProceduresController < AdminController
 
     if !@procedure.update(procedure_params)
       flash.now.alert = @procedure.errors.full_messages
-      @path = procedure_params[:path]
-      if @path.present?
-        @availability = @procedure.path_availability(current_administrateur, @path)
-      end
       render 'edit'
     elsif @procedure.brouillon?
       reset_procedure
@@ -102,31 +100,19 @@ class Admin::ProceduresController < AdminController
     end
   end
 
+  def publish_validate
+    @procedure.assign_attributes(publish_params)
+  end
+
   def publish
-    path = params[:path]
-    lien_site_web = params[:lien_site_web]
-    procedure = current_administrateur.procedures.find(params[:procedure_id])
+    @procedure.assign_attributes(publish_params)
 
-    procedure.path = path
-    procedure.lien_site_web = lien_site_web
+    @procedure.publish_or_reopen!(current_administrateur)
 
-    if !procedure.validate
-      flash.alert = 'Lien de la démarche invalide ou lien vers la démarche manquant'
-      return redirect_to admin_procedures_path
-    else
-      procedure.path = nil
-    end
-
-    if procedure.publish_or_reopen!(current_administrateur, path, lien_site_web)
-      flash.notice = "Démarche publiée"
-      redirect_to admin_procedures_path
-    else
-      @mine = false
-      render '/admin/procedures/publish', formats: 'js'
-    end
-  rescue ActiveRecord::RecordNotFound
-    flash.alert = 'Démarche inexistante'
+    flash.notice = "Démarche publiée"
     redirect_to admin_procedures_path
+  rescue ActiveRecord::RecordInvalid
+    render 'publish_validate', formats: :js
   end
 
   def transfer
@@ -220,32 +206,6 @@ class Admin::ProceduresController < AdminController
     @draft_class = 'active'
   end
 
-  def path_list
-    json_path_list = Procedure
-      .find_with_path(params[:request])
-      .order(:id)
-      .map do |procedure|
-        {
-          label: procedure.path,
-          mine: current_administrateur.owns?(procedure)
-        }
-      end.to_json
-
-    render json: json_path_list
-  end
-
-  def check_availability
-    path = params[:procedure][:path]
-    procedure_id = params[:procedure][:id]
-
-    if procedure_id.present?
-      procedure = current_administrateur.procedures.find(procedure_id)
-      @availability = procedure.path_availability(current_administrateur, path)
-    else
-      @availability = Procedure.path_availability(current_administrateur, path)
-    end
-  end
-
   def delete_logo
     @procedure.logo.purge_later
     @procedure.logo_active_storage.purge_later
@@ -274,6 +234,10 @@ class Admin::ProceduresController < AdminController
     params[:from_new_from_existing].present?
   end
 
+  def publish_params
+    params.permit(:path, :lien_site_web)
+  end
+
   def procedure_params
     editable_params = [:libelle, :description, :organisation, :direction, :lien_site_web, :cadre_juridique, :deliberation, :notice, :web_hook_url, :euro_flag, :logo, :auto_archive_on, :monavis_embed]
     permited_params = if @procedure&.locked?
diff --git a/app/controllers/admin_controller.rb b/app/controllers/admin_controller.rb
index 926bb0ff4..608c1fcef 100644
--- a/app/controllers/admin_controller.rb
+++ b/app/controllers/admin_controller.rb
@@ -25,7 +25,7 @@ class AdminController < ApplicationController
   end
 
   def reset_procedure
-    if @procedure.brouillon_avec_lien?
+    if @procedure.brouillon?
       @procedure.reset!
     end
   end
diff --git a/app/controllers/instructeurs/procedures_controller.rb b/app/controllers/instructeurs/procedures_controller.rb
index 83cc2d03d..fe323dee4 100644
--- a/app/controllers/instructeurs/procedures_controller.rb
+++ b/app/controllers/instructeurs/procedures_controller.rb
@@ -7,7 +7,7 @@ module Instructeurs
 
     def index
       @procedures = current_instructeur
-        .visible_procedures
+        .procedures
         .with_attached_logo
         .includes(:defaut_groupe_instructeur)
         .order(archived_at: :desc, published_at: :desc, created_at: :desc)
@@ -235,7 +235,7 @@ module Instructeurs
     end
 
     def redirect_to_avis_if_needed
-      if current_instructeur.visible_procedures.count == 0 && current_instructeur.avis.count > 0
+      if current_instructeur.procedures.count == 0 && current_instructeur.avis.count > 0
         redirect_to instructeur_avis_index_path
       end
     end
diff --git a/app/controllers/new_administrateur/administrateur_controller.rb b/app/controllers/new_administrateur/administrateur_controller.rb
index 2e1ad0eb4..d8828ba1c 100644
--- a/app/controllers/new_administrateur/administrateur_controller.rb
+++ b/app/controllers/new_administrateur/administrateur_controller.rb
@@ -20,7 +20,7 @@ module NewAdministrateur
     end
 
     def reset_procedure
-      if @procedure.brouillon_avec_lien?
+      if @procedure.brouillon?
         @procedure.reset!
       end
     end
diff --git a/app/controllers/users/commencer_controller.rb b/app/controllers/users/commencer_controller.rb
index 9a16ee2aa..841acd58a 100644
--- a/app/controllers/users/commencer_controller.rb
+++ b/app/controllers/users/commencer_controller.rb
@@ -3,21 +3,21 @@ module Users
     layout 'procedure_context'
 
     def commencer
-      @procedure = Procedure.publiees.find_by(path: params[:path])
-      return procedure_not_found if @procedure.blank?
+      @procedure = retrieve_procedure
+      return procedure_not_found if @procedure.blank? || @procedure.brouillon?
 
       render 'commencer/show'
     end
 
     def commencer_test
-      @procedure = Procedure.brouillons.find_by(path: params[:path])
-      return procedure_not_found if @procedure.blank?
+      @procedure = retrieve_procedure
+      return procedure_not_found if @procedure.blank? || @procedure.publiee?
 
       render 'commencer/show'
     end
 
     def sign_in
-      @procedure = Procedure.find_by(path: params[:path])
+      @procedure = retrieve_procedure
       return procedure_not_found if @procedure.blank?
 
       store_user_location!(@procedure)
@@ -25,7 +25,7 @@ module Users
     end
 
     def sign_up
-      @procedure = Procedure.find_by(path: params[:path])
+      @procedure = retrieve_procedure
       return procedure_not_found if @procedure.blank?
 
       store_user_location!(@procedure)
@@ -33,7 +33,7 @@ module Users
     end
 
     def france_connect
-      @procedure = Procedure.find_by(path: params[:path])
+      @procedure = retrieve_procedure
       return procedure_not_found if @procedure.blank?
 
       store_user_location!(@procedure)
@@ -41,23 +41,25 @@ module Users
     end
 
     def procedure_for_help
-      Procedure.publiees.find_by(path: params[:path]) || Procedure.brouillons.find_by(path: params[:path])
+      retrieve_procedure
     end
 
     private
 
+    def retrieve_procedure
+      Procedure.publiees.or(Procedure.brouillons).find_by(path: params[:path])
+    end
+
     def procedure_not_found
       procedure = Procedure.find_by(path: params[:path])
 
       if procedure&.archivee?
         flash.alert = t('errors.messages.procedure_archived')
-      elsif procedure&.publiee?
-        flash.alert = t('errors.messages.procedure_not_draft')
       else
         flash.alert = t('errors.messages.procedure_not_found')
       end
 
-      return redirect_to root_path
+      redirect_to root_path
     end
 
     def store_user_location!(procedure)
diff --git a/app/helpers/procedure_helper.rb b/app/helpers/procedure_helper.rb
index 52a834f16..38cab945b 100644
--- a/app/helpers/procedure_helper.rb
+++ b/app/helpers/procedure_helper.rb
@@ -1,11 +1,9 @@
 module ProcedureHelper
   def procedure_lien(procedure)
-    if procedure.path.present?
-      if procedure.brouillon_avec_lien?
-        commencer_test_url(path: procedure.path)
-      else
-        commencer_url(path: procedure.path)
-      end
+    if procedure.brouillon?
+      commencer_test_url(path: procedure.path)
+    else
+      commencer_url(path: procedure.path)
     end
   end
 
diff --git a/app/javascript/shared/autocomplete.js b/app/javascript/shared/autocomplete.js
index 4aefffd57..e37dec4dc 100644
--- a/app/javascript/shared/autocomplete.js
+++ b/app/javascript/shared/autocomplete.js
@@ -5,10 +5,6 @@ const sources = [
   {
     type: 'address',
     url: '/address/suggestions'
-  },
-  {
-    type: 'path',
-    url: '/admin/procedures/path_list'
   }
 ];
 
diff --git a/app/models/instructeur.rb b/app/models/instructeur.rb
index 0657032be..3cdfa45c9 100644
--- a/app/models/instructeur.rb
+++ b/app/models/instructeur.rb
@@ -24,10 +24,6 @@ class Instructeur < ApplicationRecord
 
   has_one :user
 
-  def visible_procedures
-    procedures.merge(Procedure.avec_lien.or(Procedure.archivees))
-  end
-
   def follow(dossier)
     begin
       followed_dossiers << dossier
diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index a93d73a5f..16ff6a9ee 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -45,7 +45,6 @@ class Procedure < ApplicationRecord
   scope :by_libelle,            -> { order(libelle: :asc) }
   scope :created_during,        -> (range) { where(created_at: range) }
   scope :cloned_from_library,   -> { where(cloned_from_library: true) }
-  scope :avec_lien,             -> { where.not(path: nil) }
   scope :declarative,           -> { where.not(declarative_with_state: nil) }
 
   scope :for_api, -> {
@@ -65,8 +64,10 @@ class Procedure < ApplicationRecord
   validates :libelle, presence: true, allow_blank: false, allow_nil: false
   validates :description, presence: true, allow_blank: false, allow_nil: false
   validates :administrateurs, presence: true
+  validates :lien_site_web, presence: true, if: :publiee?
+  validate :validate_for_publication, on: :publication
   validate :check_juridique
-  validates :path, format: { with: /\A[a-z0-9_\-]{3,50}\z/ }, uniqueness: { scope: :aasm_state, case_sensitive: false }, presence: true, allow_blank: false, allow_nil: true
+  validates :path, presence: true, format: { with: /\A[a-z0-9_\-]{3,50}\z/ }, uniqueness: { scope: [:path, :archived_at, :hidden_at], case_sensitive: false }
   # FIXME: remove duree_conservation_required flag once all procedures are converted to the new style
   validates :duree_conservation_dossiers_dans_ds, allow_nil: false, numericality: { only_integer: true, greater_than_or_equal_to: 1, less_than_or_equal_to: MAX_DUREE_CONSERVATION }, if: :durees_conservation_required
   validates :duree_conservation_dossiers_hors_ds, allow_nil: false, numericality: { only_integer: true, greater_than_or_equal_to: 0 }, if: :durees_conservation_required
@@ -75,7 +76,8 @@ class Procedure < ApplicationRecord
   validates_with MonAvisEmbedValidator
   before_save :update_juridique_required
   before_save :update_durees_conservation_required
-  before_create :ensure_path_exists
+  after_initialize :ensure_path_exists
+  before_save :ensure_path_exists
   after_create :ensure_default_groupe_instructeur
 
   include AASM
@@ -86,11 +88,8 @@ class Procedure < ApplicationRecord
     state :archivee
     state :hidden
 
-    event :publish, after: :after_publish, guard: :can_publish? do
+    event :publish, before: :before_publish, after: :after_publish do
       transitions from: :brouillon, to: :publiee
-    end
-
-    event :reopen, after: :after_reopen, guard: :can_publish? do
       transitions from: :archivee, to: :publiee
     end
 
@@ -109,12 +108,18 @@ class Procedure < ApplicationRecord
     end
   end
 
-  def publish_or_reopen!(administrateur, path, lien_site_web)
-    if archivee? && may_reopen?(administrateur, path, lien_site_web)
-      reopen!(administrateur, path, lien_site_web)
-    elsif may_publish?(administrateur, path, lien_site_web)
-      reset!
-      publish!(administrateur, path, lien_site_web)
+  def publish_or_reopen!(administrateur)
+    Procedure.transaction do
+      if brouillon?
+        reset!
+      end
+
+      other_procedure = other_procedure_with_path(path)
+      if other_procedure.present? && administrateur.owns?(other_procedure)
+        other_procedure.archive!
+      end
+
+      publish!
     end
   end
 
@@ -126,6 +131,44 @@ class Procedure < ApplicationRecord
     end
   end
 
+  def validate_for_publication
+    old_attributes = self.slice(:aasm_state, :archived_at)
+    self.aasm_state = :publiee
+    self.archived_at = nil
+
+    is_valid = validate
+
+    self.attributes = old_attributes
+
+    is_valid
+  end
+
+  def suggested_path(administrateur)
+    if path_customized?
+      return path
+    end
+    slug = libelle&.parameterize&.first(50)
+    suggestion = slug
+    counter = 1
+    while !path_available?(administrateur, suggestion)
+      counter = counter + 1
+      suggestion = "#{slug}-#{counter}"
+    end
+    suggestion
+  end
+
+  def other_procedure_with_path(path)
+    Procedure.publiees
+      .where.not(id: self.id)
+      .find_by(path: path)
+  end
+
+  def path_available?(administrateur, path)
+    procedure = other_procedure_with_path(path)
+
+    procedure.blank? || administrateur.owns?(procedure)
+  end
+
   def locked?
     publiee_ou_archivee?
   end
@@ -134,11 +177,6 @@ class Procedure < ApplicationRecord
     !archivee?
   end
 
-  # This method is needed for transition. Eventually this will be the same as brouillon?.
-  def brouillon_avec_lien?
-    brouillon? && path.present?
-  end
-
   def publiee_ou_archivee?
     publiee? || archivee?
   end
@@ -174,8 +212,8 @@ class Procedure < ApplicationRecord
     types_de_champ_private.map(&:build_champ)
   end
 
-  def default_path
-    libelle&.parameterize&.first(50)
+  def path_customized?
+    !path.match?(/[[:xdigit:]]{8}-[[:xdigit:]]{4}-[[:xdigit:]]{4}-[[:xdigit:]]{4}-[[:xdigit:]]{12}/)
   end
 
   def organisation_name
@@ -370,40 +408,6 @@ class Procedure < ApplicationRecord
     percentile_time(:en_construction_at, :processed_at, 90)
   end
 
-  PATH_AVAILABLE = :available
-  PATH_AVAILABLE_PUBLIEE = :available_publiee
-  PATH_NOT_AVAILABLE = :not_available
-  PATH_NOT_AVAILABLE_BROUILLON = :not_available_brouillon
-  PATH_CAN_PUBLISH = [PATH_AVAILABLE, PATH_AVAILABLE_PUBLIEE]
-
-  def path_availability(administrateur, path)
-    Procedure.path_availability(administrateur, path, id)
-  end
-
-  def self.path_availability(administrateur, path, exclude_id = nil)
-    if exclude_id.present?
-      procedure = where.not(id: exclude_id).find_by(path: path)
-    else
-      procedure = find_by(path: path)
-    end
-
-    if procedure.blank?
-      PATH_AVAILABLE
-    elsif administrateur.owns?(procedure)
-      if procedure.brouillon?
-        PATH_NOT_AVAILABLE_BROUILLON
-      else
-        PATH_AVAILABLE_PUBLIEE
-      end
-    else
-      PATH_NOT_AVAILABLE
-    end
-  end
-
-  def self.find_with_path(path)
-    where.not(aasm_state: :archivee).where("path LIKE ?", "%#{path}%")
-  end
-
   def populate_champ_stable_ids
     TypeDeChamp.where(procedure: self, stable_id: nil).find_each do |type_de_champ|
       type_de_champ.update_column(:stable_id, type_de_champ.id)
@@ -497,41 +501,21 @@ class Procedure < ApplicationRecord
       end
   end
 
-  def claim_path_ownership!(path)
-    procedure = Procedure.joins(:administrateurs)
-      .where(administrateurs: { id: administrateur_ids })
-      .find_by(path: path)
-
-    if procedure&.publiee? && procedure != self
-      procedure.archive!
-    end
-
-    update!(path: path)
+  def before_publish
+    update!(archived_at: nil)
   end
 
-  def can_publish?(administrateur, path, lien_site_web)
-    path_availability(administrateur, path).in?(PATH_CAN_PUBLISH) && lien_site_web.present?
-  end
-
-  def after_publish(administrateur, path, lien_site_web)
+  def after_publish
     update!(published_at: Time.zone.now)
-
-    claim_path_ownership!(path)
-  end
-
-  def after_reopen(administrateur, path, lien_site_web)
-    update!(published_at: Time.zone.now, archived_at: nil)
-
-    claim_path_ownership!(path)
   end
 
   def after_archive
-    update!(archived_at: Time.zone.now, path: SecureRandom.uuid)
+    update!(archived_at: Time.zone.now)
   end
 
   def after_hide
     now = Time.zone.now
-    update!(hidden_at: now, path: SecureRandom.uuid)
+    update!(hidden_at: now)
     dossiers.update_all(hidden_at: now)
   end
 
@@ -568,7 +552,7 @@ class Procedure < ApplicationRecord
   end
 
   def ensure_path_exists
-    if self.path.nil?
+    if self.path.blank?
       self.path = SecureRandom.uuid
     end
   end
diff --git a/app/serializers/procedure_serializer.rb b/app/serializers/procedure_serializer.rb
index c2608a9ff..778e236e6 100644
--- a/app/serializers/procedure_serializer.rb
+++ b/app/serializers/procedure_serializer.rb
@@ -24,12 +24,10 @@ class ProcedureSerializer < ActiveModel::Serializer
   end
 
   def link
-    if object.path.present?
-      if object.brouillon_avec_lien?
-        commencer_test_url(path: object.path)
-      else
-        commencer_url(path: object.path)
-      end
+    if object.brouillon?
+      commencer_test_url(path: object.path)
+    else
+      commencer_url(path: object.path)
     end
   end
 
diff --git a/app/views/admin/procedures/_modal_publish.html.haml b/app/views/admin/procedures/_modal_publish.html.haml
index 102e0c234..cfcfaf6cc 100644
--- a/app/views/admin/procedures/_modal_publish.html.haml
+++ b/app/views/admin/procedures/_modal_publish.html.haml
@@ -1,63 +1,49 @@
 #publish-modal.modal{ "aria-labelledby" => "myModalLabel", :role => "dialog", :tabindex => "-1" }
   .modal-dialog.modal-lg{ :role => "document" }
-    = form_tag admin_procedure_publish_path(procedure_id: @procedure.id), method: :put, remote: true do
+    = form_tag admin_procedure_publish_path(procedure_id: procedure.id), method: :put, remote: true do
       .modal-content
         .modal-header
           %button.close{ "aria-label" => "Close", "data-dismiss" => "modal", :type => "button" }
             %span{ "aria-hidden" => "true" } ×
           %h4#myModalLabel.modal-title
-            = procedure_modal_text(@procedure, :title)
+            = procedure_modal_text(procedure, :title)
             %span#publish-modal-title
         .modal-body
-          = procedure_modal_text(@procedure, :body)
-          - if !@procedure.archivee?
-            %b
-              Elle ne pourra plus être modifiée à l’issue de cette publication.
-          %br
-          Afin de faciliter l’accès à la démarche, vous êtes invité à personnaliser l’adresse d'accès si vous le souhaitez.
-          %br
+          .text-info
+            %p
+              = procedure_modal_text(procedure, :body)
+              %b Elle ne pourra plus être modifiée à l’issue de cette publication.
           .form-group
-            %br
-            %h4 Lien de la démarche
-            %p.center
+            %h4 Adresse de la démarche
+            %p Vous pouvez personnaliser le lien public de la démarche pour en faciliter l’accès.
+            %p
               = commencer_url(path: '')
-              = text_field_tag(:path, @procedure.path || @procedure.default_path,
-                                id: 'procedure_path',
-                                placeholder: 'Chemin vers la démarche',
-                                data: { autocomplete: 'path' },
-                                class: 'form-control',
-                                maxlength: 50,
-                                style: 'width: 300px; display: inline;')
-            %br
-              .alert.alert-info
-                Attention, diffusez toujours le <strong>lien complet</strong> affiché ci-dessus, et non pas un lien générique vers demarches-simplifiees.fr. Ne dites pas non plus aux usagers de se rendre sur le site générique demarches-simplifiees.fr, donnez-leur toujours le lien complet.
-                %br
-                %br
-                Prenez quelques minutes pour savoir comment établir une bonne relation avec les usagers de votre démarche :
-                = link_to "Regarder la vidéo de 5 minutes",
-                "https://vimeo.com/334463514",
-                target: "_blank"
-
+              = text_field_tag(:path, procedure.path,
+                              id: 'procedure_path',
+                              placeholder: 'chemin-de-la-démarche',
+                              required: true,
+                              class: 'form-control',
+                              pattern: '^[a-z0-9_-]{3,50}$',
+                              title: "De 3 à 50 caractères; minuscules, chiffres et tiret seulement",
+                              data: { remote: true, debounce: true, url: admin_procedure_publish_validate_path(procedure) },
+                              autocomplete: 'off',
+                              style: 'width: 300px; display: inline;')
+              = render 'publish_path_message', procedure: procedure, administrateur: administrateur
+            .text-info
+              Attention, diffusez toujours le <strong>lien complet</strong> affiché ci-dessus, et non pas un lien générique vers demarches-simplifiees.fr. Ne dites pas non plus aux usagers de se rendre sur le site générique demarches-simplifiees.fr, donnez-leur toujours le lien complet.
           .form-group
-            %h4 Où les usagers trouveront-ils le lien vers cette démarche ? *
+            %h4 Diffusion de la démarche
+            %p Où les utilisateurs trouveront-ils le lien de la démarche ? Typiquement, il s’agit d’une page de votre site web.
             %p.center
-              = text_field_tag(:lien_site_web, @procedure.lien_site_web,
+              = text_field_tag(:lien_site_web, procedure.lien_site_web,
                                 required: true,
                                 class: 'form-control',
+                                autocomplete: 'off',
                                 placeholder: 'https://exemple.gouv.fr/ma_demarche')
-
-            #path-messages
-              #path_is_mine.text-warning.center.message
-                Ce lien est déjà utilisé par une de vos démarche.
-                %br
-                Si vous voulez l’utiliser, l’ancienne démarche sera archivée (plus accessible du public).
-              #path_is_not_mine.text-danger.center.message
-                Ce lien est déjà utilisé par une démarche.
-                %br
-                Vous ne pouvez pas l’utiliser car il appartient à un autre administrateur.
-              #path_is_invalid.text-danger.center.message
-                Ce lien
-                = t('activerecord.errors.models.procedure.attributes.path.invalid')
+            .text-info
+              Prenez quelques minutes pour savoir comment établir une bonne relation avec les usagers de votre démarche :
+              = link_to "Regarder la vidéo de 5 minutes.",
+              "https://vimeo.com/334463514",
+              target: "_blank"
         .modal-footer
-          = submit_tag procedure_modal_text(@procedure, :submit), class: %w(btn btn btn-success), disabled: :disabled, id: 'publish'
-          = button_tag "Annuler", class: %w(btn btn btn-default), data: { dismiss: :modal }, id: 'cancel'
+          = render 'publish_buttons', procedure: procedure, administrateur: administrateur
diff --git a/app/views/admin/procedures/_publish_buttons.html.haml b/app/views/admin/procedures/_publish_buttons.html.haml
new file mode 100644
index 000000000..6630763d8
--- /dev/null
+++ b/app/views/admin/procedures/_publish_buttons.html.haml
@@ -0,0 +1,13 @@
+#publish-buttons
+  = button_tag "Annuler", class: %w(btn btn-default), data: { dismiss: :modal }
+
+  - procedure.validate(:publication)
+  - errors = procedure.errors
+  -# Ignore the :taken error if the path can be claimed
+  - if errors.details[:path]&.pluck(:error)&.include?(:taken) && procedure.path_available?(administrateur, procedure.path)
+    - errors.delete(:path)
+
+  - options = { class: %w(btn btn-success), id: 'publish' }
+  - if errors.details[:path].present?
+    - options[:disabled] = :disabled
+  = submit_tag procedure_modal_text(@procedure, :submit), options
diff --git a/app/views/admin/procedures/_publish_path_message.html.haml b/app/views/admin/procedures/_publish_path_message.html.haml
new file mode 100644
index 000000000..5ed0a1dcd
--- /dev/null
+++ b/app/views/admin/procedures/_publish_path_message.html.haml
@@ -0,0 +1,11 @@
+#publish-path-message
+  - procedure.validate(:publication)
+  - errors = procedure.errors
+  -# Ignore the :taken error if the path can be claimed, and instead display the :taken_can_be_claimed error message.
+  - if errors.details[:path]&.pluck(:error)&.include?(:taken) && procedure.path_available?(administrateur, procedure.path)
+    .alert.alert-warning
+      = errors.full_message('Le lien public', errors.generate_message(:path, :taken_can_be_claimed))
+  - elsif errors.messages[:path].present?
+    -# Display the actual errors for :path
+    .alert.alert-danger
+      = errors.full_message('Le lien public', errors.messages[:path].first)
diff --git a/app/views/admin/procedures/_unavailable.html.haml b/app/views/admin/procedures/_unavailable.html.haml
deleted file mode 100644
index d3c2ce71d..000000000
--- a/app/views/admin/procedures/_unavailable.html.haml
+++ /dev/null
@@ -1,11 +0,0 @@
-- case availability
-- when Procedure::PATH_AVAILABLE_PUBLIEE
-  Ce lien est déjà utilisé par une de vos démarche.
-  %br
-    Si vous voulez l’utiliser, l’ancienne démarche sera archivée lors de la publication de la démarche (plus accessible du public).
-- when Procedure::PATH_NOT_AVAILABLE_BROUILLON
-  Une démarche en test existe déjà avec ce lien.
-- when Procedure::PATH_NOT_AVAILABLE
-  Ce lien est déjà utilisé par une démarche.
-  %br
-  Vous ne pouvez pas l’utiliser car il appartient à un autre administrateur.
diff --git a/app/views/admin/procedures/check_availability.js.erb b/app/views/admin/procedures/check_availability.js.erb
deleted file mode 100644
index f5eed5960..000000000
--- a/app/views/admin/procedures/check_availability.js.erb
+++ /dev/null
@@ -1,11 +0,0 @@
-<% if @availability == Procedure::PATH_AVAILABLE %>
-  <%= remove_element('.unavailable-path-message', inner: true) %>
-<% else %>
-  <%= render_to_element('.unavailable-path-message', partial: 'unavailable', locals: { availability: @availability }) %>
-<% end %>
-
-<% if @availability.in?(Procedure::PATH_CAN_PUBLISH) %>
-  <%= enable_element('button[type=submit]') %>
-<% else %>
-  <%= disable_element('button[type=submit]') %>
-<% end %>
diff --git a/app/views/admin/procedures/publish.js.erb b/app/views/admin/procedures/publish.js.erb
deleted file mode 100644
index 9c11731ef..000000000
--- a/app/views/admin/procedures/publish.js.erb
+++ /dev/null
@@ -1 +0,0 @@
-<%= "togglePathMessage(true, #{@mine})" %>
diff --git a/app/views/admin/procedures/publish_validate.js.haml b/app/views/admin/procedures/publish_validate.js.haml
new file mode 100644
index 000000000..74c0681c3
--- /dev/null
+++ b/app/views/admin/procedures/publish_validate.js.haml
@@ -0,0 +1,4 @@
+= render_to_element("#publish-path-message", partial: 'publish_path_message', outer: true,
+  locals: { procedure: @procedure, administrateur: current_administrateur })
+= render_to_element("#publish-buttons", partial: 'publish_buttons', outer: true,
+  locals: { procedure: @procedure, administrateur: current_administrateur })
diff --git a/app/views/admin/procedures/show.html.haml b/app/views/admin/procedures/show.html.haml
index f1e353499..13c81bac4 100644
--- a/app/views/admin/procedures/show.html.haml
+++ b/app/views/admin/procedures/show.html.haml
@@ -1,7 +1,7 @@
 = render partial: 'admin/closed_mail_template_attestation_inconsistency_alert'
 .row.white-back
   #procedure_show
-    = render partial: '/admin/procedures/modal_publish'
+    = render 'modal_publish', procedure: @procedure, administrateur: @current_administrateur
     = render partial: '/admin/procedures/modal_transfer'
 
     - if @procedure.brouillon?
@@ -44,7 +44,7 @@
 
     .lien-demarche
       %h3
-        - if @procedure.brouillon_avec_lien?
+        - if @procedure.brouillon?
           Test et publication
         - else
           Publication
@@ -54,16 +54,16 @@
         - elsif @procedure.publiee?
           Cette démarche est <strong>publiée</strong>, certains éléments ne peuvent plus être modifiés.
           Pour y accéder vous pouvez utiliser le lien :
-          = link_to procedure_lien(@procedure), sanitize_url(procedure_lien(@procedure)), target: :blank, rel: :noopener
+          = link_to @procedure_lien, sanitize_url(@procedure_lien), target: :blank, rel: :noopener
           %br
           %br
           Attention, diffusez toujours le <strong>lien complet</strong> affiché ci-dessus, et non pas un lien générique vers demarches-simplifiees.fr. Ne dites pas non plus aux usagers de se rendre sur le site générique demarches-simplifiees.fr, donnez-leur toujours le lien complet.
-        - elsif @procedure.brouillon_avec_lien?
+        - elsif @procedure.brouillon?
           - if @procedure.missing_steps.empty?
             %p
               Cette démarche est actuellement <strong>en test</strong>,
               pour y accéder vous pouvez utiliser le lien :
-              = link_to procedure_lien(@procedure), sanitize_url(procedure_lien(@procedure)), target: :blank, rel: :noopener
+              = link_to @procedure_lien, sanitize_url(@procedure_lien), target: :blank, rel: :noopener
             %p
               Toute personne ayant la connaissance de ce lien pourra ainsi remplir des dossiers de test sur votre démarche.
             %br
@@ -117,7 +117,7 @@
           - if @procedure.missing_steps.include?(:service)
             %p.alert.alert-danger
               Vous devez renseigner les coordonnées de votre Service administratif avant de pouvoir publier votre démarche.
-              = link_to 'Cliquez ici.', (current_administrateur.services.present? ? url_for(services_path(procedure_id: @procedure.id)) : url_for(new_service_path(procedure_id: @procedure.id)))
+              = link_to 'Cliquez ici.', (@current_administrateur.services.present? ? url_for(services_path(procedure_id: @procedure.id)) : url_for(new_service_path(procedure_id: @procedure.id)))
 
           - if @procedure.missing_steps.include?(:instructeurs)
             %p.alert.alert-danger
diff --git a/app/views/layouts/_new_header.haml b/app/views/layouts/_new_header.haml
index eb3c7eb97..440a01b4a 100644
--- a/app/views/layouts/_new_header.haml
+++ b/app/views/layouts/_new_header.haml
@@ -15,7 +15,7 @@
       - if nav_bar_profile == :instructeur && instructeur_signed_in?
         - current_url = request.path_info
         %ul.header-tabs
-          - if current_instructeur.visible_procedures.count > 0
+          - if current_instructeur.procedures.count > 0
             %li
               = active_link_to "Démarches", instructeur_procedures_path, active: :inclusive, class: 'tab-link'
           - if current_instructeur.avis.count > 0
diff --git a/app/views/layouts/left_panels/_left_panel_admin_procedurescontroller_navbar.html.haml b/app/views/layouts/left_panels/_left_panel_admin_procedurescontroller_navbar.html.haml
index f4b646548..18d34a23d 100644
--- a/app/views/layouts/left_panels/_left_panel_admin_procedurescontroller_navbar.html.haml
+++ b/app/views/layouts/left_panels/_left_panel_admin_procedurescontroller_navbar.html.haml
@@ -11,7 +11,7 @@
   #procedure-list
     %a#onglet-infos{ href: url_for(admin_procedure_path(@procedure)) }
       .procedure-list-element{ class: ('active' if active == 'Informations') }
-        - if @procedure.brouillon_avec_lien?
+        - if @procedure.brouillon?
           Test et publication
         - else
           Publication
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index f48b60ed6..c44b18967 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -163,6 +163,8 @@ fr:
         procedure:
           attributes:
             path:
+              taken: est déjà utilisé par une démarche. Vous ne pouvez pas l’utiliser car il appartient à un autre administrateur.
+              taken_can_be_claimed: est identique à celui d’une autre de vos démarches publiées. Si vous publiez cette démarche, l’ancienne sera archivée et ne sera plus accessible au public.
               invalid: n'est pas valide. Il doit comporter au moins 3 caractères, au plus 50 caractères et seuls les caractères a-z, 0-9, '_' et '-' sont autorisés.
 
   errors:
diff --git a/config/routes.rb b/config/routes.rb
index 0bb11a794..e48f85db9 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -159,8 +159,6 @@ Rails.application.routes.draw do
     patch 'activate' => '/administrateurs/activate#create'
     get 'procedures/archived' => 'procedures#archived'
     get 'procedures/draft' => 'procedures#draft'
-    get 'procedures/path_list' => 'procedures#path_list'
-    get 'procedures/available' => 'procedures#check_availability'
 
     resources :procedures do
       collection do
@@ -176,6 +174,7 @@ Rails.application.routes.draw do
       resources :mail_templates, only: [:index, :edit, :update]
 
       put 'archive' => 'procedures#archive', as: :archive
+      get 'publish_validate' => 'procedures#publish_validate', as: :publish_validate
       put 'publish' => 'procedures#publish', as: :publish
       post 'transfer' => 'procedures#transfer', as: :transfer
       put 'clone' => 'procedures#clone', as: :clone
diff --git a/db/migrate/20190917151652_make_path_nonnull.rb b/db/migrate/20190917151652_make_path_nonnull.rb
new file mode 100644
index 000000000..401a13c84
--- /dev/null
+++ b/db/migrate/20190917151652_make_path_nonnull.rb
@@ -0,0 +1,6 @@
+class MakePathNonnull < ActiveRecord::Migration[5.2]
+  def change
+    change_column_null :procedures, :path, false
+    add_index :procedures, [:path, :archived_at, :hidden_at], unique: true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 330d17d99..9914c4180 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_09_17_120856) do
+ActiveRecord::Schema.define(version: 2019_09_17_151652) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -480,12 +480,13 @@ ActiveRecord::Schema.define(version: 2019_09_17_120856) do
     t.string "cadre_juridique"
     t.boolean "juridique_required", default: true
     t.boolean "durees_conservation_required", default: true
-    t.string "path"
+    t.string "path", null: false
     t.string "declarative_with_state"
     t.text "monavis_embed"
     t.index ["declarative_with_state"], name: "index_procedures_on_declarative_with_state"
     t.index ["hidden_at"], name: "index_procedures_on_hidden_at"
     t.index ["parent_procedure_id"], name: "index_procedures_on_parent_procedure_id"
+    t.index ["path", "archived_at", "hidden_at"], name: "index_procedures_on_path_and_archived_at_and_hidden_at", unique: true
     t.index ["service_id"], name: "index_procedures_on_service_id"
   end
 
diff --git a/spec/controllers/admin/procedures_controller_spec.rb b/spec/controllers/admin/procedures_controller_spec.rb
index 7df3010d7..b5c5fc87c 100644
--- a/spec/controllers/admin/procedures_controller_spec.rb
+++ b/spec/controllers/admin/procedures_controller_spec.rb
@@ -340,7 +340,7 @@ describe Admin::ProceduresController, type: :controller do
 
     context 'when admin is the owner of the procedure' do
       before do
-        put :publish, params: { procedure_id: procedure.id, path: path, lien_site_web: lien_site_web }
+        put :publish, format: :js, params: { procedure_id: procedure.id, path: path, lien_site_web: lien_site_web }
         procedure.reload
         procedure2.reload
       end
@@ -383,7 +383,6 @@ describe Admin::ProceduresController, type: :controller do
           expect(procedure.publiee?).to be_falsey
           expect(procedure.path).not_to match(path)
           expect(procedure.lien_site_web).to match(lien_site_web)
-          expect(response.status).to eq 200
         end
 
         it 'previous procedure remains published' do
@@ -401,8 +400,6 @@ describe Admin::ProceduresController, type: :controller do
           expect(procedure.publiee?).to be_falsey
           expect(procedure.path).not_to match(path)
           expect(procedure.lien_site_web).to match(lien_site_web)
-          expect(response).to redirect_to :admin_procedures
-          expect(flash[:alert]).to have_content 'Lien de la démarche invalide'
         end
       end
     end
@@ -419,8 +416,7 @@ describe Admin::ProceduresController, type: :controller do
       end
 
       it 'fails' do
-        expect(response).to redirect_to :admin_procedures
-        expect(flash[:alert]).to have_content 'Démarche inexistante'
+        expect(response).to have_http_status(404)
       end
     end
 
@@ -573,54 +569,6 @@ describe Admin::ProceduresController, type: :controller do
     end
   end
 
-  describe 'GET #path_list' do
-    let!(:procedure) { create(:procedure, :published, administrateur: admin) }
-    let(:admin2) { create(:administrateur) }
-    let!(:procedure2) { create(:procedure, :published, administrateur: admin2) }
-    let!(:procedure3) { create(:procedure, :published, administrateur: admin2) }
-
-    subject { get :path_list }
-
-    let(:body) { JSON.parse(response.body) }
-
-    describe 'when no params' do
-      before do
-        subject
-      end
-
-      it { expect(response.status).to eq(200) }
-      it { expect(body.size).to eq(3) }
-      it { expect(body.first['label']).to eq(procedure.path) }
-      it { expect(body.first['mine']).to be_truthy }
-      it { expect(body.second['label']).to eq(procedure2.path) }
-      it { expect(body.second['mine']).to be_falsy }
-    end
-
-    context 'filtered' do
-      before do
-        subject
-      end
-
-      subject { get :path_list, params: { request: URI.encode(procedure2.path) } }
-
-      it { expect(response.status).to eq(200) }
-      it { expect(body.size).to eq(1) }
-      it { expect(body.first['label']).to eq(procedure2.path) }
-      it { expect(body.first['mine']).to be_falsy }
-    end
-
-    context 'when procedure is archived' do
-      let!(:procedure3) { create(:procedure, :archived, administrateur: admin2) }
-      before do
-        subject
-      end
-
-      it 'do not return on the json' do
-        expect(body.size).to eq(2)
-      end
-    end
-  end
-
   describe 'POST #transfer' do
     let!(:procedure) { create :procedure, :with_service, administrateur: admin }
 
@@ -716,63 +664,6 @@ describe Admin::ProceduresController, type: :controller do
     end
   end
 
-  describe "GET #check_availability" do
-    render_views
-    let(:procedure) { create(:procedure, :with_path, administrateur: admin) }
-    let(:params) {
-      {
-        procedure: {
-          path: path,
-          id: procedure.id
-        }
-      }
-    }
-    let(:path) { generate(:published_path) }
-
-    before do
-      get :check_availability, params: params, format: 'js'
-    end
-
-    context 'self path' do
-      let(:path) { procedure.path }
-
-      it { expect(response.body).to include("innerHTML = ''") }
-    end
-
-    context 'available path' do
-      it { expect(response.body).to include("innerHTML = ''") }
-    end
-
-    context 'my path (brouillon)' do
-      let(:procedure_owned) { create(:procedure, :with_path, administrateur: admin) }
-      let(:path) { procedure_owned.path }
-
-      it {
-        expect(response.body).to include('Une démarche en test existe déjà avec ce lien.')
-      }
-    end
-
-    context 'my path' do
-      let(:procedure_owned) { create(:procedure, :published, administrateur: admin) }
-      let(:path) { procedure_owned.path }
-
-      it {
-        expect(response.body).to include('Ce lien est déjà utilisé par une de vos démarche.')
-        expect(response.body).to include('Si vous voulez l’utiliser, l’ancienne démarche sera archivée')
-      }
-    end
-
-    context 'unavailable path' do
-      let(:procedure_not_owned) { create(:procedure, :with_path, administrateur: create(:administrateur)) }
-      let(:path) { procedure_not_owned.path }
-
-      it {
-        expect(response.body).to include('Ce lien est déjà utilisé par une démarche.')
-        expect(response.body).to include('Vous ne pouvez pas l’utiliser car il appartient à un autre administrateur.')
-      }
-    end
-  end
-
   describe 'PATCH #monavis' do
     let!(:procedure) { create(:procedure, administrateur: admin) }
     let(:procedure_params) {
diff --git a/spec/factories/procedure.rb b/spec/factories/procedure.rb
index 118b1c7d5..3cfdd52dc 100644
--- a/spec/factories/procedure.rb
+++ b/spec/factories/procedure.rb
@@ -11,6 +11,7 @@ FactoryBot.define do
     duree_conservation_dossiers_hors_ds { 6 }
     ask_birthday { false }
     lien_site_web { "https://mon-site.gouv" }
+    path { SecureRandom.uuid }
 
     transient do
       administrateur {}
@@ -48,7 +49,8 @@ FactoryBot.define do
       after(:build) do |procedure, _evaluator|
         procedure.for_individual = true
         procedure.types_de_champ << create(:type_de_champ, libelle: 'Texte obligatoire', mandatory: true)
-        procedure.publish!(procedure.administrateurs.first, generate(:published_path), procedure.lien_site_web)
+        procedure.path = generate(:published_path)
+        procedure.publish!
       end
     end
 
@@ -147,13 +149,15 @@ FactoryBot.define do
 
     trait :published do
       after(:build) do |procedure, _evaluator|
-        procedure.publish!(procedure.administrateurs.first, generate(:published_path), procedure.lien_site_web)
+        procedure.path = generate(:published_path)
+        procedure.publish!
       end
     end
 
     trait :archived do
       after(:build) do |procedure, _evaluator|
-        procedure.publish!(procedure.administrateurs.first, generate(:published_path), procedure.lien_site_web)
+        procedure.path = generate(:published_path)
+        procedure.publish!
         procedure.archive!
       end
     end
@@ -162,14 +166,16 @@ FactoryBot.define do
       # For now the behavior is the same than :archived
       # (it may be different in the future though)
       after(:build) do |procedure, _evaluator|
-        procedure.publish!(procedure.administrateurs.first, generate(:published_path), procedure.lien_site_web)
+        procedure.path = generate(:published_path)
+        procedure.publish!
         procedure.archive!
       end
     end
 
     trait :hidden do
       after(:build) do |procedure, _evaluator|
-        procedure.publish!(procedure.administrateurs.first, generate(:published_path), procedure.lien_site_web)
+        procedure.path = generate(:published_path)
+        procedure.publish!
         procedure.hide!
       end
     end
diff --git a/spec/features/admin/procedure_cloning_spec.rb b/spec/features/admin/procedure_cloning_spec.rb
index eb908a012..74442d89f 100644
--- a/spec/features/admin/procedure_cloning_spec.rb
+++ b/spec/features/admin/procedure_cloning_spec.rb
@@ -7,23 +7,39 @@ feature 'As an administrateur I wanna clone a procedure', js: true do
   let(:administrateur) { create(:administrateur) }
 
   before do
+    create :procedure, :with_service,
+      aasm_state: :publiee, published_at: Time.zone.now,
+      administrateurs: [administrateur],
+      libelle: 'libellé de la procédure',
+      path: 'libelle-de-la-procedure'
     login_as administrateur.user, scope: :user
-    visit new_from_existing_admin_procedures_path
   end
 
-  context 'Cloning procedure' do
-    before 'Create procedure' do
-      page.find_by_id('from-scratch').click
-      fill_in_dummy_procedure_details
-      page.find_by_id('save-procedure').click
-    end
-
-    scenario 'Cloning' do
-      visit admin_procedures_draft_path
+  context 'Cloning a procedure owned by the current admin' do
+    scenario do
+      visit admin_procedures_path
       expect(page.find_by_id('procedures')['data-item-count']).to eq('1')
       page.all('.clone-btn').first.click
       visit admin_procedures_draft_path
-      expect(page.find_by_id('procedures')['data-item-count']).to eq('2')
+      expect(page.find_by_id('procedures')['data-item-count']).to eq('1')
+      click_on Procedure.last.libelle
+      expect(page).to have_current_path(admin_procedure_path(Procedure.last))
+
+      find('#publish-procedure').click
+
+      within '#publish-modal' do
+        expect(find_field('procedure_path').value).to eq 'libelle-de-la-procedure'
+        expect(page).to have_text('ancienne sera archivée')
+        fill_in 'lien_site_web', with: 'http://some.website'
+        click_on 'publish'
+      end
+
+      page.refresh
+
+      visit admin_procedures_archived_path
+      expect(page.find_by_id('procedures')['data-item-count']).to eq('1')
+      visit admin_procedures_draft_path
+      expect(page.find_by_id('procedures')['data-item-count']).to eq('0')
     end
   end
 end
diff --git a/spec/features/admin/procedure_creation_spec.rb b/spec/features/admin/procedure_creation_spec.rb
index afd26564c..5abfec21c 100644
--- a/spec/features/admin/procedure_creation_spec.rb
+++ b/spec/features/admin/procedure_creation_spec.rb
@@ -98,11 +98,16 @@ feature 'As an administrateur I wanna create a new procedure', js: true do
       click_on Procedure.last.libelle
       expect(page).to have_current_path(admin_procedure_path(Procedure.last))
 
+      expect(page).to have_content('en test')
+      # Only check the path even though the link is the complete URL
+      # (Capybara runs the app on an arbitrary host/port.)
+      expect(page).to have_link(nil, href: /#{commencer_test_path(Procedure.last.path)}/)
+
       expect(page).to have_selector('#publish-procedure', visible: true)
       find('#publish-procedure').click
 
       within '#publish-modal' do
-        expect(page).to have_field('procedure_path')
+        expect(find_field('procedure_path').value).to eq 'libelle-de-la-procedure'
         fill_in 'lien_site_web', with: 'http://some.website'
         click_on 'publish'
       end
diff --git a/spec/models/instructeur_spec.rb b/spec/models/instructeur_spec.rb
index 281123918..5b0ba0ed4 100644
--- a/spec/models/instructeur_spec.rb
+++ b/spec/models/instructeur_spec.rb
@@ -12,31 +12,6 @@ describe Instructeur, type: :model do
     assign(procedure_2)
   end
 
-  describe '#visible_procedures' do
-    let(:procedure_not_assigned)           { create :procedure, administrateur: admin }
-    let(:procedure_with_default_path)      { create :procedure, administrateur: admin }
-    let(:procedure_with_custom_path)       { create :procedure, :with_path, administrateur: admin }
-    let(:procedure_archived_manually)      { create :procedure, :archived, administrateur: admin }
-    let(:procedure_archived_automatically) { create :procedure, :archived_automatically, administrateur: admin }
-
-    before do
-      assign(procedure_with_default_path)
-      assign(procedure_with_custom_path)
-      assign(procedure_archived_manually)
-      assign(procedure_archived_automatically)
-    end
-
-    subject { instructeur.visible_procedures }
-
-    it do
-      expect(subject).not_to include(procedure_not_assigned)
-      expect(subject).to include(procedure_with_default_path)
-      expect(subject).to include(procedure_with_custom_path)
-      expect(subject).to include(procedure_archived_manually)
-      expect(subject).to include(procedure_archived_automatically)
-    end
-  end
-
   describe 'follow' do
     let(:dossier) { create :dossier }
     let(:already_followed_dossier) { create :dossier }
diff --git a/spec/models/procedure_spec.rb b/spec/models/procedure_spec.rb
index 0ddc65d61..c95879de4 100644
--- a/spec/models/procedure_spec.rb
+++ b/spec/models/procedure_spec.rb
@@ -547,12 +547,12 @@ describe Procedure do
   end
 
   describe '#publish!' do
-    let(:procedure) { create(:procedure) }
+    let(:procedure) { create(:procedure, path: 'example-path') }
     let(:now) { Time.zone.now.beginning_of_minute }
 
     before do
       Timecop.freeze(now)
-      procedure.publish!(procedure.administrateurs.first, "example-path", procedure.lien_site_web)
+      procedure.publish!
     end
     after { Timecop.return }
 
@@ -616,6 +616,22 @@ describe Procedure do
     it { expect(procedure.archived_at).to eq(now) }
   end
 
+  describe 'path_customized?' do
+    let(:procedure) { create :procedure }
+
+    subject { procedure.path_customized? }
+
+    context 'when the path is still the default' do
+      it { is_expected.to be_falsey }
+    end
+
+    context 'when the path has been changed' do
+      before { procedure.path = 'custom_path' }
+
+      it { is_expected.to be_truthy }
+    end
+  end
+
   describe 'total_dossier' do
     let(:procedure) { create :procedure }
 
@@ -630,12 +646,45 @@ describe Procedure do
     it { is_expected.to eq 2 }
   end
 
-  describe '#default_path' do
-    let(:procedure) { create(:procedure, libelle: 'A long libelle with àccênts, blabla coucou hello un deux trois voila') }
+  describe 'suggested_path' do
+    let(:procedure) { create :procedure, aasm_state: :publiee, libelle: 'Inscription au Collège' }
 
-    subject { procedure.default_path }
+    subject { procedure.suggested_path(procedure.administrateurs.first) }
 
-    it { is_expected.to eq('a-long-libelle-with-accents-blabla-coucou-hello-un') }
+    context 'when the path has been customized' do
+      before { procedure.path = 'custom_path' }
+
+      it { is_expected.to eq 'custom_path' }
+    end
+
+    context 'when the suggestion does not conflict' do
+      it { is_expected.to eq 'inscription-au-college' }
+    end
+
+    context 'when the suggestion conflicts with one procedure' do
+      before do
+        create :procedure, aasm_state: :publiee, path: 'inscription-au-college'
+      end
+
+      it { is_expected.to eq 'inscription-au-college-2' }
+    end
+
+    context 'when the suggestion conflicts with several procedures' do
+      before do
+        create :procedure, aasm_state: :publiee, path: 'inscription-au-college'
+        create :procedure, aasm_state: :publiee, path: 'inscription-au-college-2'
+      end
+
+      it { is_expected.to eq 'inscription-au-college-3' }
+    end
+
+    context 'when the suggestion conflicts with another procedure of the same admin' do
+      before do
+        create :procedure, aasm_state: :publiee, path: 'inscription-au-college', administrateurs: procedure.administrateurs
+      end
+
+      it { is_expected.to eq 'inscription-au-college' }
+    end
   end
 
   describe ".default_scope" do
diff --git a/spec/views/admin/procedures/show.html.haml_spec.rb b/spec/views/admin/procedures/show.html.haml_spec.rb
index f98d1eb91..c1ec1bffe 100644
--- a/spec/views/admin/procedures/show.html.haml_spec.rb
+++ b/spec/views/admin/procedures/show.html.haml_spec.rb
@@ -6,6 +6,7 @@ describe 'admin/procedures/show.html.haml', type: :view do
 
   before do
     assign(:procedure, procedure)
+    assign(:procedure_lien, commencer_url(path: procedure.path))
   end
 
   describe 'procedure is draft' do
@@ -41,7 +42,7 @@ describe 'admin/procedures/show.html.haml', type: :view do
 
   describe 'procedure is published' do
     before do
-      procedure.publish!(procedure.administrateurs.first, 'fake_path', procedure.lien_site_web)
+      procedure.publish!
       procedure.reload
       render
     end
@@ -59,7 +60,7 @@ describe 'admin/procedures/show.html.haml', type: :view do
 
   describe 'procedure is archived' do
     before do
-      procedure.publish!(procedure.administrateurs.first, 'fake_path', procedure.lien_site_web)
+      procedure.publish!
       procedure.archive!
       procedure.reload
       render