diff --git a/app/assets/javascripts/new_design/champs/linked_drop_down_list.js b/app/assets/javascripts/new_design/champs/linked_drop_down_list.js
new file mode 100644
index 000000000..d82bf438f
--- /dev/null
+++ b/app/assets/javascripts/new_design/champs/linked_drop_down_list.js
@@ -0,0 +1,30 @@
+document.addEventListener('turbolinks:load', function() {
+  var primaries, i, primary, secondary, secondaryOptions;
+
+  primaries = document.querySelectorAll('select[data-secondary-options]');
+  for (i = 0; i < primaries.length; i++) {
+    primary = primaries[i];
+    secondary = document.querySelector('select[data-secondary-id="' + primary.dataset.primaryId + '"]');
+    secondaryOptions = JSON.parse(primary.dataset.secondaryOptions);
+
+    primary.addEventListener('change', function(e) {
+      var option, options, element;
+
+      while ((option = secondary.firstChild)) {
+        secondary.removeChild(option);
+      }
+
+      options = secondaryOptions[e.target.value];
+
+      for (i = 0; i < options.length; i++) {
+        option = options[i];
+        element = document.createElement("option");
+        element.textContent = option;
+        element.value = option;
+        secondary.appendChild(element);
+      }
+
+      secondary.selectedIndex = 0;
+    });
+  }
+});
diff --git a/app/controllers/new_user/dossiers_controller.rb b/app/controllers/new_user/dossiers_controller.rb
index 905f78ebe..361eb3765 100644
--- a/app/controllers/new_user/dossiers_controller.rb
+++ b/app/controllers/new_user/dossiers_controller.rb
@@ -145,7 +145,7 @@ module NewUser
     def champs_params
       params.permit(dossier: {
         champs_attributes: [
-          :id, :value, :piece_justificative_file, value: [],
+          :id, :value, :primary_value, :secondary_value, :piece_justificative_file, value: [],
           etablissement_attributes: Champs::SiretChamp::ETABLISSEMENT_ATTRIBUTES
         ]
       })
diff --git a/app/models/champ.rb b/app/models/champ.rb
index f396e988c..dc8007442 100644
--- a/app/models/champ.rb
+++ b/app/models/champ.rb
@@ -10,6 +10,7 @@ class Champ < ApplicationRecord
   scope :updated_since?, -> (date) { where('champs.updated_at > ?', date) }
   scope :public_only, -> { where(private: false) }
   scope :private_only, -> { where(private: true) }
+  scope :ordered, -> { includes(:type_de_champ).order('types_de_champ.order_place') }
 
   def public?
     !private?
@@ -35,6 +36,10 @@ class Champ < ApplicationRecord
     end
   end
 
+  def main_value_name
+    :value
+  end
+
   private
 
   def string_value
diff --git a/app/models/champs/linked_drop_down_list_champ.rb b/app/models/champs/linked_drop_down_list_champ.rb
index 20fb7455a..ef02e78f4 100644
--- a/app/models/champs/linked_drop_down_list_champ.rb
+++ b/app/models/champs/linked_drop_down_list_champ.rb
@@ -1,2 +1,36 @@
 class Champs::LinkedDropDownListChamp < Champ
+  attr_reader :primary_value, :secondary_value
+  delegate :primary_options, :secondary_options, to: :type_de_champ
+
+  after_initialize :unpack_value
+
+  def unpack_value
+    if value.present?
+      primary, secondary = JSON.parse(value)
+    else
+      primary = secondary = ''
+    end
+    @primary_value ||= primary
+    @secondary_value ||= secondary
+  end
+
+  def primary_value=(value)
+    @primary_value = value
+    pack_value
+  end
+
+  def secondary_value=(value)
+    @secondary_value = value
+    pack_value
+  end
+
+  def main_value_name
+    :primary_value
+  end
+
+  private
+
+  def pack_value
+    self.value = JSON.generate([ primary_value, secondary_value ])
+  end
 end
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 646aee849..c02facd83 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -104,15 +104,11 @@ class Dossier < ApplicationRecord
   end
 
   def ordered_champs
-    # TODO: use the line below when the procedure preview does not leak champ with dossier_id == 0
-    # champs.joins(:type_de_champ).order('types_de_champ.order_place')
-    champs.joins(', types_de_champ').where("champs.type_de_champ_id = types_de_champ.id AND types_de_champ.procedure_id = #{procedure.id}").order('order_place')
+    champs.ordered
   end
 
   def ordered_champs_private
-    # TODO: use the line below when the procedure preview does not leak champ with dossier_id == 0
-    # champs_private.includes(:type_de_champ).order('types_de_champ.order_place')
-    champs_private.joins(', types_de_champ').where("champs.type_de_champ_id = types_de_champ.id AND types_de_champ.procedure_id = #{procedure.id}").order('order_place')
+    champs_private.ordered
   end
 
   def ordered_pieces_justificatives
diff --git a/app/models/types_de_champ/linked_drop_down_list_type_de_champ.rb b/app/models/types_de_champ/linked_drop_down_list_type_de_champ.rb
index e54cbef7f..6e602a97f 100644
--- a/app/models/types_de_champ/linked_drop_down_list_type_de_champ.rb
+++ b/app/models/types_de_champ/linked_drop_down_list_type_de_champ.rb
@@ -1,2 +1,31 @@
 class TypesDeChamp::LinkedDropDownListTypeDeChamp < TypeDeChamp
+  PRIMARY_PATTERN = /^--(.*)--$/
+
+  def primary_options
+    primary_options = unpack_options.map(&:first)
+    if primary_options.present?
+      primary_options.unshift('')
+    end
+    primary_options
+  end
+
+  def secondary_options
+    secondary_options = unpack_options.to_h
+    if secondary_options.present?
+      secondary_options[''] = []
+    end
+    secondary_options
+  end
+
+  private
+
+  def unpack_options
+    _, *options = drop_down_list.options
+    chunked = options.slice_before(PRIMARY_PATTERN)
+    chunked.map do |chunk|
+      primary, *secondary = chunk
+      secondary.unshift('')
+      [PRIMARY_PATTERN.match(primary)[1], secondary]
+    end
+  end
 end
diff --git a/app/views/layouts/_new_header.haml b/app/views/layouts/_new_header.haml
index dad1e8d20..a5c6f5883 100644
--- a/app/views/layouts/_new_header.haml
+++ b/app/views/layouts/_new_header.haml
@@ -36,7 +36,7 @@
       - if nav_bar_profile == :user
         %ul.header-tabs
           %li
-            = active_link_to "Dossiers", dossiers_path, active: :inclusive, class: 'tab-link'
+            = active_link_to "Dossiers", users_dossiers_path, active: :inclusive, class: 'tab-link'
 
     %ul.header-right-content
       - if nav_bar_profile == :gestionnaire && gestionnaire_signed_in?
diff --git a/app/views/layouts/new_application.html.haml b/app/views/layouts/new_application.html.haml
index affb3ad19..a6a10c443 100644
--- a/app/views/layouts/new_application.html.haml
+++ b/app/views/layouts/new_application.html.haml
@@ -17,6 +17,9 @@
     = stylesheet_link_tag "new_design/new_application", media: "all", "data-turbolinks-track": "reload"
     = stylesheet_link_tag "new_design/print", media: "print", "data-turbolinks-track": true
 
+    - if Rails.env.development?
+      = stylesheet_link_tag :xray
+
   %body
     .page-wrapper
       = render partial: "layouts/support_navigator_banner"
@@ -35,6 +38,10 @@
       = render partial: "layouts/mailjet_newsletter"
 
       = javascript_include_tag "new_design/application", "data-turbolinks-eval": false
+
+      - if Rails.env.development?
+        = javascript_include_tag :xray
+
       = yield :charts_js
       - if Rails.env == "test"
         %script{ type: "text/javascript" }
diff --git a/app/views/shared/dossiers/editable_champs/_champ_label.html.haml b/app/views/shared/dossiers/editable_champs/_champ_label.html.haml
index 8c1070299..6ba997ae9 100644
--- a/app/views/shared/dossiers/editable_champs/_champ_label.html.haml
+++ b/app/views/shared/dossiers/editable_champs/_champ_label.html.haml
@@ -1,4 +1,4 @@
-= form.label :value do
+= form.label champ.main_value_name do
   #{champ.libelle}
   - if champ.mandatory?
     %span.mandatory *
diff --git a/app/views/shared/dossiers/editable_champs/_linked_drop_down_list.html.haml b/app/views/shared/dossiers/editable_champs/_linked_drop_down_list.html.haml
new file mode 100644
index 000000000..03afe6832
--- /dev/null
+++ b/app/views/shared/dossiers/editable_champs/_linked_drop_down_list.html.haml
@@ -0,0 +1,10 @@
+- if champ.drop_down_list && champ.drop_down_list.options.any?
+  - champ_id = champ.object_id
+  = form.select :primary_value,
+    champ.primary_options,
+    { required: champ.mandatory? },
+    { data: { "secondary-options" => champ.secondary_options, "primary-id" => champ_id } }
+  = form.select :secondary_value,
+    champ.secondary_options[champ.primary_value],
+    { required: champ.mandatory? },
+    { data: { "secondary-id" => champ_id } }
diff --git a/app/views/users/sessions/new.html.haml b/app/views/users/sessions/new.html.haml
index 3412a0439..943afd7a3 100644
--- a/app/views/users/sessions/new.html.haml
+++ b/app/views/users/sessions/new.html.haml
@@ -50,7 +50,7 @@
         = link_to "", france_connect_particulier_path, class: "login-with-fc"
 
       .center
-        = link_to "Qu’est-ce que FranceConnect ?", "https://franceconnect.gouv.fr/", target: "_blank", class: "link"
+        = link_to "Qu’est-ce que FranceConnect ?", "https://app.franceconnect.gouv.fr/en-savoir-plus", target: "_blank", class: "link"
 
       - if resource_name == :user
         %hr
diff --git a/lib/tasks/2018_05_21_cerfa_to_pj.rake b/lib/tasks/2018_05_21_cerfa_to_pj.rake
index 2dcabd4c9..59406195a 100644
--- a/lib/tasks/2018_05_21_cerfa_to_pj.rake
+++ b/lib/tasks/2018_05_21_cerfa_to_pj.rake
@@ -3,9 +3,9 @@ namespace :'2018_05_21_cerfa_to_pj' do
     dossiers = Cerfa.includes(dossier: [:procedure]).all.reject(&:empty?).map(&:dossier).compact.uniq
 
     dossiers.group_by(&:procedure).each do |procedure, dossiers|
-      if !procedure.type_de_champs.find_by(libelle: 'CERFA')
+      if !procedure.types_de_champ.find_by(libelle: 'CERFA')
         procedure.administrateur.enable_feature(:champ_pj)
-        type_de_champ = procedure.type_de_champs.create(
+        type_de_champ = procedure.types_de_champ.create(
           type_champ: 'piece_justificative',
           libelle: 'CERFA'
         )
diff --git a/lib/tasks/support.rake b/lib/tasks/support.rake
index 2f70a7816..f4bbb82cc 100644
--- a/lib/tasks/support.rake
+++ b/lib/tasks/support.rake
@@ -31,4 +31,21 @@ namespace :support do
       pp.update(administrateur: new_owner)
     end
   end
+
+  desc <<~EOD
+    Delete the user account for a given USER_MAIL.
+    Only works if the user has no dossier where the instruction has started.
+  EOD
+  task delete_user_account: :environment do
+    user_mail = ENV['USER_MAIL']
+    if user_mail.nil?
+      fail "Must specify a USER_MAIL"
+    end
+    user = User.find_by(email: user_mail)
+    if user.dossiers.state_instruction_commencee.any?
+      fail "Cannot delete this user because instruction has started for some dossiers"
+    end
+    user.dossiers.each { |d| d.delete_and_keep_track }
+    user.destroy
+  end
 end
diff --git a/spec/features/new_user/linked_dropdown_spec.rb b/spec/features/new_user/linked_dropdown_spec.rb
new file mode 100644
index 000000000..01758f0bc
--- /dev/null
+++ b/spec/features/new_user/linked_dropdown_spec.rb
@@ -0,0 +1,76 @@
+require 'spec_helper'
+
+feature 'linked dropdown lists' do
+  let(:password) { 'secret_password' }
+  let!(:user) { create(:user, password: password) }
+
+  let(:list_items) do
+    <<~END_OF_LIST
+      --Primary 1--
+      Secondary 1.1
+      Secondary 1.2
+      --Primary 2--
+      Secondary 2.1
+      Secondary 2.2
+      Secondary 2.3
+    END_OF_LIST
+  end
+  let(:drop_down_list) { create(:drop_down_list, value: list_items) }
+  let(:type_de_champ) { create(:type_de_champ_linked_drop_down_list, libelle: 'linked dropdown', drop_down_list: drop_down_list) }
+
+  let!(:procedure) do
+    p = create(:procedure, :published, :for_individual)
+    p.types_de_champ << type_de_champ
+    p
+  end
+
+  let(:user_dossier) { user.dossiers.first }
+
+  scenario 'change primary value, secondary options are updated', js: true do
+    log_in(user.email, password, procedure)
+
+    fill_individual
+
+    # Select a primary value
+    select('Primary 2', from: primary_id_for('linked dropdown'))
+
+    # Secondary menu reflects chosen primary value
+    expect(page).to have_select(secondary_id_for('linked dropdown'), options: ['', 'Secondary 2.1', 'Secondary 2.2', 'Secondary 2.3'])
+
+    # Select another primary value
+    select('Primary 1', from: primary_id_for('linked dropdown'))
+
+    # Secondary menu gets updated
+    expect(page).to have_select(secondary_id_for('linked dropdown'), options: ['', 'Secondary 1.1', 'Secondary 1.2'])
+  end
+
+  private
+
+  def log_in(email, password, procedure)
+    visit "/commencer/#{procedure.procedure_path.path}"
+    expect(page).to have_current_path(new_user_session_path)
+
+    fill_in 'user_email', with: email
+    fill_in 'user_password', with: password
+    click_on 'Se connecter'
+    expect(page).to have_current_path(identite_dossier_path(user_dossier))
+  end
+
+  def fill_individual
+    fill_in('individual_prenom', with: 'prenom')
+    fill_in('individual_nom', with: 'nom')
+    check 'dossier_autorisation_donnees'
+    click_on 'Continuer'
+    expect(page).to have_current_path(modifier_dossier_path(user_dossier))
+  end
+
+  def primary_id_for(libelle)
+    find(:xpath, ".//label[contains(text()[normalize-space()], '#{libelle}')]")[:for]
+  end
+
+  def secondary_id_for(libelle)
+    primary_id = primary_id_for(libelle)
+    link = find("\##{primary_id}")['data-primary-id']
+    find("[data-secondary-id=\"#{link}\"]")['id']
+  end
+end
diff --git a/spec/models/champs/linked_drop_down_list_champ_spec.rb b/spec/models/champs/linked_drop_down_list_champ_spec.rb
new file mode 100644
index 000000000..95327e5cb
--- /dev/null
+++ b/spec/models/champs/linked_drop_down_list_champ_spec.rb
@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe Champs::LinkedDropDownListChamp do
+  describe '#unpack_value' do
+    let(:champ) { described_class.new(value: '["tata", "tutu"]') }
+
+    it { expect(champ.primary_value).to eq('tata') }
+    it { expect(champ.secondary_value).to eq('tutu') }
+  end
+
+  describe '#pack_value' do
+    let(:champ) { described_class.new(primary_value: 'tata', secondary_value: 'tutu') }
+
+    before { champ.save }
+
+    it { expect(champ.value).to eq('["tata","tutu"]') }
+  end
+end
diff --git a/spec/models/types_de_champ/linked_drop_down_list_type_de_champ_spec.rb b/spec/models/types_de_champ/linked_drop_down_list_type_de_champ_spec.rb
new file mode 100644
index 000000000..ab0fcf203
--- /dev/null
+++ b/spec/models/types_de_champ/linked_drop_down_list_type_de_champ_spec.rb
@@ -0,0 +1,40 @@
+require 'spec_helper'
+
+describe TypesDeChamp::LinkedDropDownListTypeDeChamp do
+  describe '#unpack_options' do
+    let(:drop_down_list) { build(:drop_down_list, value: menu_options) }
+    let(:type_de_champ) { described_class.new(drop_down_list: drop_down_list) }
+
+    context 'with no options' do
+      let(:menu_options) { '' }
+      it { expect(type_de_champ.secondary_options).to eq({}) }
+      it { expect(type_de_champ.primary_options).to eq([]) }
+    end
+
+    context 'with two primary options' do
+      let(:menu_options) do
+        <<~END_OPTIONS
+          --Primary 1--
+          secondary 1.1
+          secondary 1.2
+          --Primary 2--
+          secondary 2.1
+          secondary 2.2
+          secondary 2.3
+        END_OPTIONS
+      end
+
+      it do
+        expect(type_de_champ.secondary_options).to eq(
+          {
+            '' => [],
+            'Primary 1' => [ '', 'secondary 1.1', 'secondary 1.2'],
+            'Primary 2' => [ '', 'secondary 2.1', 'secondary 2.2', 'secondary 2.3']
+          }
+        )
+      end
+
+      it { expect(type_de_champ.primary_options).to eq([ '', 'Primary 1', 'Primary 2' ]) }
+    end
+  end
+end
diff --git a/spec/views/layouts/_new_header_spec.rb b/spec/views/layouts/_new_header_spec.rb
index 17ceb970b..49fd3345a 100644
--- a/spec/views/layouts/_new_header_spec.rb
+++ b/spec/views/layouts/_new_header_spec.rb
@@ -15,7 +15,7 @@ describe 'layouts/_new_header.html.haml', type: :view do
       let(:profile) { :user }
 
       it { is_expected.to have_css("a.header-logo[href=\"#{users_dossiers_path}\"]") }
-      it { is_expected.to have_link("Dossiers", href: dossiers_path) }
+      it { is_expected.to have_link("Dossiers", href: users_dossiers_path) }
     end
 
     context 'when rendering for gestionnaire' do