diff --git a/app/components/status_tag/component.rb b/app/components/status_tag/component.rb
index ceeb8d70aa..6c56e0129c 100644
--- a/app/components/status_tag/component.rb
+++ b/app/components/status_tag/component.rb
@@ -21,6 +21,7 @@ def classes
 
     COLOURS = {
       accepted: "green",
+      assessment: "blue",
       assessment_in_progress: "blue",
       awarded: "green",
       awarded_pending_checks: "turquoise",
@@ -37,6 +38,7 @@ def classes
       overdue_qualification: "pink",
       overdue_reference: "pink",
       potential_duplicate_in_dqt: "pink",
+      pre_assessment: "pink",
       preliminary_check: "pink",
       received: "purple",
       received_further_information: "purple",
@@ -45,8 +47,10 @@ def classes
       received_reference: "purple",
       rejected: "red",
       requested: "yellow",
+      review: "purple",
       submitted: "grey",
       valid: "green",
+      verification: "yellow",
       waiting_on: "yellow",
       waiting_on_further_information: "yellow",
       waiting_on_professional_standing: "yellow",
diff --git a/app/components/timeline_entry/component.rb b/app/components/timeline_entry/component.rb
index d1870d1cd1..58121b0198 100644
--- a/app/components/timeline_entry/component.rb
+++ b/app/components/timeline_entry/component.rb
@@ -170,5 +170,24 @@ def action_required_by_changed_vars
           end,
       }
     end
+
+    def stage_changed_vars
+      {
+        old_stage:
+          render(
+            StatusTag::Component.new(
+              status: timeline_event.old_value,
+              class_context: "timeline-event",
+            ),
+          ).strip,
+        new_stage:
+          render(
+            StatusTag::Component.new(
+              status: timeline_event.new_value,
+              class_context: "timeline-event",
+            ),
+          ).strip,
+      }
+    end
   end
 end
diff --git a/app/lib/application_form_status_updater.rb b/app/lib/application_form_status_updater.rb
index 30b061175f..34466c9921 100644
--- a/app/lib/application_form_status_updater.rb
+++ b/app/lib/application_form_status_updater.rb
@@ -43,6 +43,15 @@ def call
           new_value: action_required_by,
         )
       end
+
+      if (old_stage = application_form.stage) != stage
+        application_form.update!(stage:)
+        create_timeline_event(
+          event_type: "stage_changed",
+          old_value: old_stage,
+          new_value: stage,
+        )
+      end
     end
   end
 
@@ -182,6 +191,40 @@ def action_required_by
       end
   end
 
+  def stage
+    @stage ||=
+      if application_form.withdrawn_at.present? ||
+           application_form.declined_at.present? ||
+           application_form.awarded_at.present?
+        "completed"
+      elsif dqt_trn_request.present?
+        "review"
+      elsif preliminary_check? ||
+            (
+              teaching_authority_provides_written_statement &&
+                waiting_on_professional_standing
+            )
+        "pre_assessment"
+      elsif overdue_professional_standing || overdue_qualification ||
+            overdue_reference ||
+            (
+              !teaching_authority_provides_written_statement &&
+                received_professional_standing
+            ) || received_qualification || received_reference ||
+            waiting_on_professional_standing || waiting_on_qualification ||
+            waiting_on_reference
+        "verification"
+      elsif overdue_further_information || received_further_information ||
+            waiting_on_further_information ||
+            assessment&.any_not_preliminary_section_finished?
+        "assessment"
+      elsif application_form.submitted_at.present?
+        "not_started"
+      else
+        "draft"
+      end
+  end
+
   delegate :assessment,
            :dqt_trn_request,
            :region,
diff --git a/app/models/application_form.rb b/app/models/application_form.rb
index f454daf7d1..77ac8a4683 100644
--- a/app/models/application_form.rb
+++ b/app/models/application_form.rb
@@ -43,6 +43,7 @@
 #  registration_number                           :text
 #  registration_number_status                    :string           default("not_started"), not null
 #  requires_preliminary_check                    :boolean          default(FALSE), not null
+#  stage                                         :string           default("draft"), not null
 #  status                                        :string           default("draft"), not null
 #  subjects                                      :text             default([]), not null, is an Array
 #  subjects_status                               :string           default("not_started"), not null
@@ -76,6 +77,7 @@
 #  index_application_forms_on_reference                     (reference) UNIQUE
 #  index_application_forms_on_region_id                     (region_id)
 #  index_application_forms_on_reviewer_id                   (reviewer_id)
+#  index_application_forms_on_stage                         (stage)
 #  index_application_forms_on_status                        (status)
 #  index_application_forms_on_teacher_id                    (teacher_id)
 #
@@ -132,6 +134,17 @@ class ApplicationForm < ApplicationRecord
        },
        _prefix: true
 
+  enum stage: {
+         draft: "draft",
+         pre_assessment: "pre_assessment",
+         not_started: "not_started",
+         assessment: "assessment",
+         verification: "verification",
+         review: "review",
+         completed: "completed",
+       },
+       _suffix: true
+
   enum status: {
          draft: "draft",
          submitted: "submitted",
diff --git a/app/models/timeline_event.rb b/app/models/timeline_event.rb
index c41481fde2..8ffb896733 100644
--- a/app/models/timeline_event.rb
+++ b/app/models/timeline_event.rb
@@ -75,6 +75,7 @@ class TimelineEvent < ApplicationRecord
          requestable_received: "requestable_received",
          requestable_requested: "requestable_requested",
          reviewer_assigned: "reviewer_assigned",
+         stage_changed: "stage_changed",
          state_changed: "state_changed",
        }
 
@@ -152,11 +153,17 @@ class TimelineEvent < ApplicationRecord
   validates :old_value,
             :new_value,
             presence: true,
-            if: -> { action_required_by_changed? || information_changed? }
+            if: -> do
+              action_required_by_changed? || information_changed? ||
+                stage_changed?
+            end
   validates :old_value,
             :new_value,
             absence: true,
-            unless: -> { action_required_by_changed? || information_changed? }
+            unless: -> do
+              action_required_by_changed? || information_changed? ||
+                stage_changed?
+            end
   validates :column_name, presence: true, if: :information_changed?
   validates :work_history_id,
             :column_name,
diff --git a/config/analytics.yml b/config/analytics.yml
index f0c015e04d..2eba07d5dd 100644
--- a/config/analytics.yml
+++ b/config/analytics.yml
@@ -68,6 +68,7 @@
     - registration_number_status
     - requires_preliminary_check
     - reviewer_id
+    - stage
     - status
     - subjects
     - subjects_status
diff --git a/config/locales/components.en.yml b/config/locales/components.en.yml
index 399f9249f9..adafbdb5e5 100644
--- a/config/locales/components.en.yml
+++ b/config/locales/components.en.yml
@@ -2,6 +2,7 @@ en:
   components:
     status_tag:
       accepted: Accepted
+      assessment: Assessment
       assessment_in_progress: Assessment in progress
       awarded: Awarded
       awarded_pending_checks: Award pending
@@ -19,6 +20,7 @@ en:
       overdue_qualification: Overdue qualification
       overdue_reference: Overdue reference
       potential_duplicate_in_dqt: Potential duplication in DQT
+      pre_assessment: Pre-assessment
       preliminary_check: Preliminary check
       received: Received
       received_further_information: Received further information
@@ -27,8 +29,10 @@ en:
       received_reference: Received reference
       rejected: Rejected
       requested: Waiting on
+      review: Review
       submitted: Not started
       valid: Valid
+      verification: Verification
       waiting_on: Waiting on
       waiting_on_further_information: Waiting on further information
       waiting_on_professional_standing: Waiting on professional standing
@@ -39,14 +43,14 @@ en:
     timeline_entry:
       title:
         action_required_by_changed: Action required by changed
-        assessor_assigned: Assessor assigned
-        reviewer_assigned: Reviewer assigned
-        state_changed: Status changed
-        assessment_section_completed: Section completed
-        note_created: Note created
-        email_sent: Email sent
         age_range_subjects_verified: Age range and subjects verified
+        assessment_section_completed: Section completed
         assessment_section_recorded: Assessment section recorded
+        assessor_assigned: Assessor assigned
+        email_sent: Email sent
+        information_changed: Information changed after submission
+        note_created: Note created
+        reviewer_assigned: Reviewer assigned
         requestable_requested:
           FurtherInformationRequest: Further information requested
           ProfessionalStandingRequest: Professional standing requested
@@ -67,14 +71,14 @@ en:
           ProfessionalStandingRequest: Professional standing assessed
           QualificationRequest: Qualification assessed
           ReferenceRequest: Reference assessed
-        information_changed: Information changed after submission
+        stage_changed: Stage changed
+        state_changed: Status changed
       description:
         action_required_by_changed: Application requires %{action} action.
         assessor_assigned: "%{assignee_name} is assigned as the assessor."
-        reviewer_assigned: "%{assignee_name} is assigned as the reviewer."
-        state_changed: Status changed from %{old_state} to %{new_state}.
-        note_created: "%{text}"
         email_sent: "%{subject}"
+        note_created: "%{text}"
+        reviewer_assigned: "%{assignee_name} is assigned as the reviewer."
         requestable_requested:
           FurtherInformationRequest: Further information has been requested.
           ProfessionalStandingRequest: The professional standing has been requested.
@@ -95,6 +99,8 @@ en:
           ProfessionalStandingRequest: The professional standing request has been assessed.
           QualificationRequest: A qualification has been assessed.
           ReferenceRequest: A reference has been assessed.
+        stage_changed: Stage changed from %{old_stage} to %{new_stage}.
+        state_changed: Status changed from %{old_state} to %{new_state}.
       columns:
         contact_email: Reference email address
         contact_job: Reference job
diff --git a/db/migrate/20230914084340_add_stage_to_application_forms.rb b/db/migrate/20230914084340_add_stage_to_application_forms.rb
new file mode 100644
index 0000000000..1a18a02f91
--- /dev/null
+++ b/db/migrate/20230914084340_add_stage_to_application_forms.rb
@@ -0,0 +1,10 @@
+class AddStageToApplicationForms < ActiveRecord::Migration[7.0]
+  def change
+    add_column :application_forms,
+               :stage,
+               :string,
+               default: "draft",
+               null: false
+    add_index :application_forms, :stage
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 356d3d0673..8620b61695 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[7.0].define(version: 2023_09_12_144508) do
+ActiveRecord::Schema[7.0].define(version: 2023_09_14_084340) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -106,6 +106,7 @@
     t.jsonb "dqt_match", default: {}
     t.datetime "withdrawn_at"
     t.string "action_required_by", default: "none", null: false
+    t.string "stage", default: "draft", null: false
     t.index ["action_required_by"], name: "index_application_forms_on_action_required_by"
     t.index ["assessor_id"], name: "index_application_forms_on_assessor_id"
     t.index ["english_language_provider_id"], name: "index_application_forms_on_english_language_provider_id"
@@ -114,6 +115,7 @@
     t.index ["reference"], name: "index_application_forms_on_reference", unique: true
     t.index ["region_id"], name: "index_application_forms_on_region_id"
     t.index ["reviewer_id"], name: "index_application_forms_on_reviewer_id"
+    t.index ["stage"], name: "index_application_forms_on_stage"
     t.index ["status"], name: "index_application_forms_on_status"
     t.index ["teacher_id"], name: "index_application_forms_on_teacher_id"
   end
diff --git a/spec/components/timeline_entry_spec.rb b/spec/components/timeline_entry_spec.rb
index 5b8d9692da..051a83ef7d 100644
--- a/spec/components/timeline_entry_spec.rb
+++ b/spec/components/timeline_entry_spec.rb
@@ -518,4 +518,24 @@
       expect(component.text).to include(creator.name)
     end
   end
+
+  context "stage changed" do
+    let(:timeline_event) { create(:timeline_event, :stage_changed) }
+    let(:old_stage) do
+      I18n.t("components.status_tag.#{timeline_event.old_value}")
+    end
+    let(:new_stage) do
+      I18n.t("components.status_tag.#{timeline_event.new_value}")
+    end
+
+    it "describes the event" do
+      expect(component.text.squish).to include(
+        "Stage changed from #{old_stage} to #{new_stage}",
+      )
+    end
+
+    it "attributes to the creator" do
+      expect(component.text).to include(creator.name)
+    end
+  end
 end
diff --git a/spec/factories/application_forms.rb b/spec/factories/application_forms.rb
index 31f30f0b19..b2023353ec 100644
--- a/spec/factories/application_forms.rb
+++ b/spec/factories/application_forms.rb
@@ -43,6 +43,7 @@
 #  registration_number                           :text
 #  registration_number_status                    :string           default("not_started"), not null
 #  requires_preliminary_check                    :boolean          default(FALSE), not null
+#  stage                                         :string           default("draft"), not null
 #  status                                        :string           default("draft"), not null
 #  subjects                                      :text             default([]), not null, is an Array
 #  subjects_status                               :string           default("not_started"), not null
@@ -76,6 +77,7 @@
 #  index_application_forms_on_reference                     (reference) UNIQUE
 #  index_application_forms_on_region_id                     (region_id)
 #  index_application_forms_on_reviewer_id                   (reviewer_id)
+#  index_application_forms_on_stage                         (stage)
 #  index_application_forms_on_status                        (status)
 #  index_application_forms_on_teacher_id                    (teacher_id)
 #
@@ -140,8 +142,42 @@
       action_required_by { "none" }
     end
 
-    trait :submitted do
+    trait :draft_stage do
+      stage { "draft" }
+      action_required_by_none
+    end
+
+    trait :pre_assessment_stage do
+      stage { "pre_assessment" }
+      action_required_by_admin
+    end
+
+    trait :not_started_stage do
+      stage { "not_started" }
       action_required_by_assessor
+    end
+
+    trait :assessment_stage do
+      stage { "assessment" }
+      action_required_by_assessor
+    end
+
+    trait :verification_stage do
+      stage { "verification" }
+    end
+
+    trait :review_stage do
+      stage { "review" }
+      action_required_by_assessor
+    end
+
+    trait :completed_stage do
+      stage { "completed" }
+      action_required_by_none
+    end
+
+    trait :submitted do
+      not_started_stage
       status { "submitted" }
       submitted_at { Time.zone.now }
       working_days_since_submission { 0 }
@@ -160,59 +196,65 @@
 
     trait :preliminary_check do
       submitted
-      action_required_by_admin
+      pre_assessment_stage
       requires_preliminary_check { true }
       status { "preliminary_check" }
     end
 
     trait :assessment_in_progress do
       submitted
+      assessment_stage
       status { "assessment_in_progress" }
     end
 
     trait :waiting_on do
       submitted
       action_required_by_external
+      verification_stage
       status { "waiting_on" }
     end
 
     trait :received do
       submitted
+      verification_stage
       status { "received" }
     end
 
     trait :overdue do
       submitted
+      verification_stage
       status { "overdue" }
     end
 
     trait :awarded_pending_checks do
       submitted
+      review_stage
       status { "awarded_pending_checks" }
     end
 
     trait :potential_duplicate_in_dqt do
       submitted
+      review_stage
       status { "potential_duplicate_in_dqt" }
     end
 
     trait :awarded do
       submitted
-      action_required_by_none
+      completed_stage
       status { "awarded" }
       awarded_at { Time.zone.now }
     end
 
     trait :declined do
       submitted
-      action_required_by_none
+      completed_stage
       status { "declined" }
       declined_at { Time.zone.now }
     end
 
     trait :withdrawn do
       submitted
-      action_required_by_none
+      completed_stage
       status { "withdrawn" }
       withdrawn_at { Time.zone.now }
     end
diff --git a/spec/factories/timeline_events.rb b/spec/factories/timeline_events.rb
index d9a2af715f..89c356e78e 100644
--- a/spec/factories/timeline_events.rb
+++ b/spec/factories/timeline_events.rb
@@ -111,5 +111,11 @@
       old_value { %w[admin assessor external none].sample }
       new_value { %w[admin assessor external none].sample }
     end
+
+    trait :stage_changed do
+      event_type { "stage_changed" }
+      old_value { ApplicationForm.stages.values.sample }
+      new_value { ApplicationForm.stages.values.sample }
+    end
   end
 end
diff --git a/spec/lib/application_form_status_updater_spec.rb b/spec/lib/application_form_status_updater_spec.rb
index 45e05b8a41..2d785a1a9b 100644
--- a/spec/lib/application_form_status_updater_spec.rb
+++ b/spec/lib/application_form_status_updater_spec.rb
@@ -40,6 +40,22 @@
     end
   end
 
+  shared_examples "changes stage" do |new_stage|
+    it "changes status to #{new_stage}" do
+      expect { call }.to change(application_form, :stage).to(new_stage)
+    end
+
+    it "records a timeline event" do
+      expect { call }.to have_recorded_timeline_event(
+        :stage_changed,
+        creator: user,
+        application_form:,
+        old_value: "draft",
+        new_value: new_stage,
+      )
+    end
+  end
+
   shared_examples "changes status" do |new_status|
     it "changes status to #{new_status}" do
       expect { call }.to change(application_form, :status).to(new_status)
@@ -66,6 +82,7 @@
       end
 
       include_examples "changes action required by", "assessor"
+      include_examples "changes stage", "review"
       include_examples "changes status", "potential_duplicate_in_dqt"
     end
 
@@ -78,6 +95,7 @@
       end
 
       include_examples "doesn't change action required by"
+      include_examples "changes stage", "completed"
       include_examples "changes status", "withdrawn"
     end
 
@@ -90,6 +108,7 @@
       end
 
       include_examples "doesn't change action required by"
+      include_examples "changes stage", "completed"
       include_examples "changes status", "declined"
     end
 
@@ -102,6 +121,7 @@
       end
 
       include_examples "doesn't change action required by"
+      include_examples "changes stage", "completed"
       include_examples "changes status", "awarded"
     end
 
@@ -112,6 +132,7 @@
       end
 
       include_examples "changes action required by", "assessor"
+      include_examples "changes stage", "review"
       include_examples "changes status", "awarded_pending_checks"
     end
 
@@ -124,6 +145,7 @@
       end
 
       include_examples "changes action required by", "assessor"
+      include_examples "changes stage", "assessment"
       include_examples "changes status", "received"
 
       it "changes received_further_information" do
@@ -143,6 +165,7 @@
       end
 
       include_examples "changes action required by", "external"
+      include_examples "changes stage", "assessment"
       include_examples "changes status", "waiting_on"
 
       it "changes waiting_on_further_information" do
@@ -162,6 +185,7 @@
       end
 
       include_examples "changes action required by", "external"
+      include_examples "changes stage", "verification"
       include_examples "changes status", "waiting_on"
 
       it "changes waiting_on_professional_standing" do
@@ -185,6 +209,7 @@
         end
 
         include_examples "changes action required by", "assessor"
+        include_examples "changes stage", "not_started"
         include_examples "changes status", "submitted"
 
         it "doesn't change received_professional_standing" do
@@ -202,6 +227,7 @@
         end
 
         include_examples "changes action required by", "assessor"
+        include_examples "changes stage", "verification"
         include_examples "changes status", "received"
 
         it "changes received_professional_standing" do
@@ -222,6 +248,7 @@
       end
 
       include_examples "changes action required by", "assessor"
+      include_examples "changes stage", "verification"
       include_examples "changes status", "received"
 
       it "changes received_further_information" do
@@ -241,6 +268,7 @@
       end
 
       include_examples "changes action required by", "external"
+      include_examples "changes stage", "verification"
       include_examples "changes status", "waiting_on"
 
       it "changes waiting_on_qualification" do
@@ -275,6 +303,7 @@
         end
 
         include_examples "changes action required by", "external"
+        include_examples "changes stage", "verification"
         include_examples "changes status", "waiting_on"
 
         it "doesn't change received_reference" do
@@ -304,6 +333,7 @@
 
         context "and it's the only reference request" do
           include_examples "changes action required by", "assessor"
+          include_examples "changes stage", "verification"
           include_examples "changes status", "received"
 
           it "changes received_reference" do
@@ -318,6 +348,7 @@
           before { create(:reference_request, :requested, assessment:) }
 
           include_examples "changes action required by", "external"
+          include_examples "changes stage", "verification"
           include_examples "changes status", "waiting_on"
 
           it "doesn't change received_reference" do
@@ -347,6 +378,7 @@
         end
 
         include_examples "changes action required by", "assessor"
+        include_examples "changes stage", "verification"
         include_examples "changes status", "received"
 
         it "changes received_reference" do
@@ -366,6 +398,7 @@
       end
 
       include_examples "changes action required by", "external"
+      include_examples "changes stage", "verification"
       include_examples "changes status", "waiting_on"
 
       it "changes waiting_on_reference" do
@@ -382,6 +415,7 @@
       end
 
       include_examples "changes action required by", "assessor"
+      include_examples "changes stage", "assessment"
       include_examples "changes status", "assessment_in_progress"
     end
 
@@ -389,6 +423,7 @@
       before { application_form.update!(submitted_at: Time.zone.now) }
 
       include_examples "changes action required by", "assessor"
+      include_examples "changes stage", "not_started"
       include_examples "changes status", "submitted"
     end
 
@@ -400,6 +435,13 @@
       it "doesn't record a timeline event" do
         expect { call }.to_not have_recorded_timeline_event(:state_changed)
       end
+      it "doesn't change the stage from draft" do
+        expect { call }.to_not change(application_form, :stage).from("draft")
+      end
+
+      it "doesn't record a timeline event" do
+        expect { call }.to_not have_recorded_timeline_event(:stage_changed)
+      end
 
       include_examples "doesn't change action required by"
     end
@@ -419,6 +461,7 @@
       end
 
       include_examples "changes action required by", "admin"
+      include_examples "changes stage", "pre_assessment"
       include_examples "changes status", "preliminary_check"
 
       context "when teaching authority provides written statement" do
@@ -430,12 +473,14 @@
         end
 
         include_examples "changes action required by", "admin"
+        include_examples "changes stage", "pre_assessment"
         include_examples "changes status", "preliminary_check"
 
         context "when the preliminary check has passed" do
           before { preliminary_assessment_section.update!(passed: true) }
 
           include_examples "changes action required by", "external"
+          include_examples "changes stage", "pre_assessment"
           include_examples "changes status", "waiting_on"
         end
 
@@ -449,12 +494,14 @@
           end
 
           include_examples "changes action required by", "admin"
+          include_examples "changes stage", "pre_assessment"
           include_examples "changes status", "preliminary_check"
 
           context "and the application form is declined" do
             before { application_form.update!(declined_at: Time.zone.now) }
 
             include_examples "doesn't change action required by"
+            include_examples "changes stage", "completed"
             include_examples "changes status", "declined"
           end
         end
diff --git a/spec/models/application_form_spec.rb b/spec/models/application_form_spec.rb
index d1b6c51b36..ce0249496b 100644
--- a/spec/models/application_form_spec.rb
+++ b/spec/models/application_form_spec.rb
@@ -43,6 +43,7 @@
 #  registration_number                           :text
 #  registration_number_status                    :string           default("not_started"), not null
 #  requires_preliminary_check                    :boolean          default(FALSE), not null
+#  stage                                         :string           default("draft"), not null
 #  status                                        :string           default("draft"), not null
 #  subjects                                      :text             default([]), not null, is an Array
 #  subjects_status                               :string           default("not_started"), not null
@@ -76,6 +77,7 @@
 #  index_application_forms_on_reference                     (reference) UNIQUE
 #  index_application_forms_on_region_id                     (region_id)
 #  index_application_forms_on_reviewer_id                   (reviewer_id)
+#  index_application_forms_on_stage                         (stage)
 #  index_application_forms_on_status                        (status)
 #  index_application_forms_on_teacher_id                    (teacher_id)
 #
@@ -113,6 +115,19 @@
         .with_prefix
         .backed_by_column_of_type(:string)
 
+      is_expected.to define_enum_for(:stage)
+        .with_values(
+          draft: "draft",
+          pre_assessment: "pre_assessment",
+          not_started: "not_started",
+          assessment: "assessment",
+          verification: "verification",
+          review: "review",
+          completed: "completed",
+        )
+        .with_suffix
+        .backed_by_column_of_type(:string)
+
       is_expected.to define_enum_for(:status).with_values(
         draft: "draft",
         submitted: "submitted",
diff --git a/spec/models/timeline_event_spec.rb b/spec/models/timeline_event_spec.rb
index 2f4bea97c9..7325614cb2 100644
--- a/spec/models/timeline_event_spec.rb
+++ b/spec/models/timeline_event_spec.rb
@@ -91,6 +91,7 @@
         requestable_received: "requestable_received",
         requestable_requested: "requestable_requested",
         reviewer_assigned: "reviewer_assigned",
+        stage_changed: "stage_changed",
         state_changed: "state_changed",
       ).backed_by_column_of_type(:string)
     end
@@ -410,5 +411,28 @@
       it { is_expected.to validate_presence_of(:old_value) }
       it { is_expected.to validate_presence_of(:new_value) }
     end
+
+    context "with a stage changed event type" do
+      before { timeline_event.event_type = :stage_changed }
+
+      it { is_expected.to validate_absence_of(:assignee) }
+      it { is_expected.to validate_absence_of(:old_state) }
+      it { is_expected.to validate_absence_of(:new_state) }
+      it { is_expected.to validate_absence_of(:assessment_section) }
+      it { is_expected.to validate_absence_of(:note) }
+      it { is_expected.to validate_absence_of(:mailer_class_name) }
+      it { is_expected.to validate_absence_of(:mailer_action_name) }
+      it { is_expected.to validate_absence_of(:message_subject) }
+      it { is_expected.to validate_absence_of(:assessment) }
+      it { is_expected.to validate_absence_of(:age_range_min) }
+      it { is_expected.to validate_absence_of(:age_range_max) }
+      it { is_expected.to validate_absence_of(:subjects) }
+      it { is_expected.to validate_absence_of(:requestable_id) }
+      it { is_expected.to validate_absence_of(:requestable_type) }
+      it { is_expected.to validate_absence_of(:work_history_id) }
+      it { is_expected.to validate_absence_of(:column_name) }
+      it { is_expected.to validate_presence_of(:old_value) }
+      it { is_expected.to validate_presence_of(:new_value) }
+    end
   end
 end