diff --git a/app/controllers/concerns/authorization.rb b/app/controllers/concerns/authorization.rb
index e4b7c333a..0a235f10d 100644
--- a/app/controllers/concerns/authorization.rb
+++ b/app/controllers/concerns/authorization.rb
@@ -89,6 +89,7 @@ def current_user_teaching_staff_of_assignment?(assignment_id)
     (
         current_user_instructs_assignment?(assignment) ||
         current_user_has_ta_mapping_for_assignment?(assignment)
+        # TODO: include a check to allow admins or superadmins access to assignments their child instructors can access
     )
   end
 
diff --git a/app/controllers/grades_controller.rb b/app/controllers/grades_controller.rb
index 287a64996..67b89a439 100644
--- a/app/controllers/grades_controller.rb
+++ b/app/controllers/grades_controller.rb
@@ -6,7 +6,7 @@ def action_allowed?
         when 'view_our_scores','view_my_scores'
             set_participant_and_team_via_assignment
             current_user_is_assignment_participant?(params[:assignment_id])
-        when 'view_all_scores'
+        when 'view_all_scores', 'get_review_tableau_data'
             current_user_teaching_staff_of_assignment?(params[:assignment_id])
         when 'edit', 'assign_grade', 'instructor_review'
             set_team_and_assignment_via_participant
@@ -54,6 +54,105 @@ def view_my_scores
     end
 
 
+    # (GET /api/v1/grades/:assignment_id/:participant_id/get_review_tableau_data)
+    # Given an AssignmentParticipant ID, gather and return all reviews completed by that participant for the corresponding assignment.
+    def get_review_tableau_data
+        responses_by_round = {}
+        begin
+            # Determine all questionnaires used as part of this assignment, grouped by the round in which they are used.
+            AssignmentQuestionnaire.where("assignment_id = " + params[:assignment_id]).find_each do |pairing|
+                round_id = pairing[:used_in_round]
+                rubric_id = pairing[:questionnaire_id]
+
+                # If this round has not been recorded yet, record it.
+                if !responses_by_round.key?(round_id)
+                    responses_by_round[round_id] = {}
+                end
+                # If this questionnaire has not been recorded yet, record it.
+                if !responses_by_round[round_id].key?(rubric_id)
+                    # Items (the "questions") are always the same across responses of the same rubric.
+                    # Initialize them into a hash using a helper function.
+                    responses_by_round[round_id] = get_items_from_questionnaire(rubric_id)
+                end
+            end
+
+            response_mapping_condition = "reviewed_object_id = " + params[:assignment_id] + " AND reviewer_id = " + params[:participant_id]
+            ReviewResponseMap.where(response_mapping_condition).find_each do |mapping|
+                Response.where("map_id = " + mapping[:id].to_s).find_each do |response|
+
+                    # response = Response.find_by(map_id: mapping[:id])
+
+                    if response == nil
+                        # If, for some reason, there is no response with this mapping id, move on to the next mapping id.
+                        next
+                    end
+
+                    response_id = response[:id]
+                    round_id = response[:round]
+
+                    if !responses_by_round.key?(round_id)
+                        # If, for some reason, there is no questionnaire associated with the given round, move on to the next mapping id.
+                        next
+                    end
+
+                    # Record this response's values and comments, one pair for each item in the corresponding questionnaire.
+                    responses_by_round[round_id].each_key do |item_id|
+                        response_answer = Answer.find_by(item_id: item_id, response_id: response_id)
+                        responses_by_round[round_id][item_id][:answers][:values].append(response_answer[:answer])
+                        responses_by_round[round_id][item_id][:answers][:comments].append(response_answer[:comments])
+                    end
+                end
+            end
+
+            # Get participant and user information for the response
+            participant = AssignmentParticipant.find(params[:participant_id])
+            assignment = Assignment.find(params[:assignment_id])
+
+            # Return JSON containing all answer values and comments associated with this reviewer and for this assignment.
+            render json: {
+                responses_by_round: responses_by_round,
+                participant: {
+                    id: participant.id,
+                    user_id: participant.user_id,
+                    user_name: participant.user.name,
+                    full_name: participant.user.full_name,
+                    handle: participant.handle
+                },
+                assignment: {
+                    id: assignment.id,
+                    name: assignment.name
+                }
+            }
+        rescue ActiveRecord::RecordNotFound
+          render json: { error: "Participant or assignment not found" }, status: :not_found
+        rescue StandardError => e
+          render json: { error: "Internal server error" }, status: :internal_server_error
+        end
+    end
+
+    # A helper function which, given a questionnaire id, returns a hash keyed by the ids of that questionnaire's items.
+    # The values of the hash include the description (usually a question) of the item, and an empty hash for including responses.
+    def get_items_from_questionnaire(questionnaire_id)
+        questionnaire = Questionnaire.find_by(id: questionnaire_id)
+        item_data = {
+            min_answer_value: questionnaire[:min_question_score],
+            max_answer_value: questionnaire[:max_question_score],
+            items: {}
+        }
+        Item.where("questionnaire_id = " + questionnaire_id.to_s).find_each do |item|
+            item_data[:items][item[:id]] = {
+                description: item[:txt],
+                question_type: item[:question_type],
+                answers: {
+                    values: [],
+                    comments: []
+                }
+            }
+        end
+        return item_data
+    end
+
+
     # edit (GET /api/v1/grades/:participant_id/edit)
     # provides data for the grade-assignment interface.
     # Given an AssignmentParticipant ID, it looks up the participant and its assignment, gathers the full list of items 
diff --git a/config/routes.rb b/config/routes.rb
index 25642363c..eff7d3b04 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -144,6 +144,7 @@
           get '/:assignment_id/view_all_scores', to: 'grades#view_all_scores'
           patch '/:participant_id/assign_grade', to: 'grades#assign_grade'
           get '/:participant_id/edit', to: 'grades#edit'
+          get '/:assignment_id/:participant_id/get_review_tableau_data', to: 'grades#get_review_tableau_data'
           get '/:assignment_id/view_our_scores', to: 'grades#view_our_scores'
           get '/:assignment_id/view_my_scores', to: 'grades#view_my_scores'
           get '/:participant_id/instructor_review', to: 'grades#instructor_review'
diff --git a/spec/controllers/grades_controller_get_review_tableau_data_spec.rb b/spec/controllers/grades_controller_get_review_tableau_data_spec.rb
new file mode 100644
index 000000000..951e9c36b
--- /dev/null
+++ b/spec/controllers/grades_controller_get_review_tableau_data_spec.rb
@@ -0,0 +1,176 @@
+require 'rails_helper'
+
+RSpec.describe GradesController, type: :controller do
+  let(:assignment_id) { "10" }
+  let(:participant_id) { "20" }
+
+  # Fake User
+  let(:user) { instance_double(User, id: 99, name: "ReviewerUser", full_name: "Reviewer User") }
+
+  # Fake AssignmentParticipant
+  let(:fake_participant) do
+    double("AssignmentParticipant", id: participant_id.to_i, user_id: user.id, user: user, handle: "reviewer_handle").tap do |p|
+      allow(p).to receive(:[]).with(:id).and_return(p.id)
+      allow(p).to receive(:[]).with(:user_id).and_return(p.user_id)
+      allow(p).to receive(:[]).with(:handle).and_return(p.handle)
+    end
+  end
+
+  # Fake Assignment
+  let(:assignment) { instance_double(Assignment, id: assignment_id.to_i, name: "Test Assignment") }
+
+  # Fake AssignmentQuestionnaire
+  let(:fake_questionnaire) do
+    double("AssignmentQuestionnaire", used_in_round: 1, questionnaire_id: 999).tap do |q|
+      allow(q).to receive(:[]).with(:used_in_round).and_return(1)
+      allow(q).to receive(:[]).with(:questionnaire_id).and_return(999)
+    end
+  end
+
+  # Fake Item
+  let(:fake_item) do
+    double("Item", id: 1, txt: "Criterion 1", question_type: "Scale").tap do |item|
+      allow(item).to receive(:[]).with(:id).and_return(item.id)
+      allow(item).to receive(:[]).with(:txt).and_return(item.txt)
+      allow(item).to receive(:[]).with(:question_type).and_return(item.question_type)
+    end
+  end
+
+  # Fake ReviewResponseMap
+  let(:fake_response_map) { instance_double(ReviewResponseMap, id: 555) }
+
+  # Fake Response
+  let(:fake_response) { instance_double(Response, id: 777, round: 1) }
+
+  # Fake Answer
+  let(:fake_answer) { instance_double(Answer, answer: 4, comments: "Good work") }
+
+  # Expected JSON keys
+  let(:expected_json_keys) { %w[responses_by_round participant assignment] }
+
+  before do
+    # Stub ActiveRecord finders
+    allow(Assignment).to receive(:find).with(assignment_id).and_return(assignment)
+    allow(AssignmentParticipant).to receive(:find).with(participant_id).and_return(fake_participant)
+
+    # Stub AssignmentQuestionnaire query
+    fake_relation = double("ActiveRecord::Relation")
+    allow(fake_relation).to receive(:find_each).and_yield(fake_questionnaire)
+    allow(AssignmentQuestionnaire).to receive(:where)
+                                        .with("assignment_id = #{assignment_id}")
+                                        .and_return(fake_relation)
+
+    # Stub Item query
+    fake_item_relation = double("ActiveRecord::Relation")
+    allow(fake_item_relation).to receive(:find_each).and_yield(fake_item)
+    allow(Item).to receive(:where).with("questionnaire_id = 999").and_return(fake_item_relation)
+
+    # Use simple hashes instead of instance_double for hash-style access
+    fake_response_map = { id: 555 }
+    fake_response     = { id: 777, round: 1 }
+    fake_item         = { id: 1, txt: "Criterion 1", question_type: "Scale" }
+    fake_answer       = { answer: 4, comments: "Good work" }
+
+    # Stub ReviewResponseMap.where(...).find_each
+    fake_review_map_relation = double("ActiveRecord::Relation")
+    allow(fake_review_map_relation).to receive(:find_each).and_yield(fake_response_map)
+    allow(ReviewResponseMap).to receive(:where)
+                                  .with("reviewed_object_id = #{assignment_id} AND reviewer_id = #{participant_id}")
+                                  .and_return(fake_review_map_relation)
+
+    # Stub Response.where(...).find_each
+    fake_response_relation = double("ActiveRecord::Relation")
+    allow(fake_response_relation).to receive(:find_each).and_yield(fake_response)
+    allow(Response).to receive(:where)
+                         .with("map_id = #{fake_response_map[:id]}")
+                         .and_return(fake_response_relation)
+
+    # Stub Answer.find_by(...)
+    allow(Answer).to receive(:find_by)
+                       .with(item_id: fake_item[:id], response_id: fake_response[:id])
+                       .and_return(fake_answer)
+
+    # Controller authorization stubs
+    allow(controller).to receive(:authorize).and_return(true)
+    allow(controller).to receive(:current_user).and_return(user)
+    allow(controller).to receive(:has_role?).and_return(true)
+    allow(controller).to receive(:action_allowed?).and_return(true)
+
+    # Stub JWT decoding (if using token auth)
+    request.headers['Authorization'] = 'Bearer faketoken'
+    allow(JsonWebToken).to receive(:decode).and_return({ id: user.id })
+    allow(User).to receive(:find).with(user.id).and_return(user)
+  end
+
+  describe "GET #get_review_tableau_data" do
+    it "responds with valid JSON containing required keys" do
+      get :get_review_tableau_data, params: { assignment_id: assignment_id, participant_id: participant_id }
+
+      expect(response).to have_http_status(:ok)
+
+      json = JSON.parse(response.body)
+      expect(json.keys).to include(*expected_json_keys)
+    end
+
+    it "returns 404 if participant is not found" do
+      allow(AssignmentParticipant).to receive(:find).with(participant_id).and_raise(ActiveRecord::RecordNotFound)
+
+      get :get_review_tableau_data, params: { assignment_id: assignment_id, participant_id: participant_id }
+
+      expect(response).to have_http_status(:not_found)
+      json = JSON.parse(response.body)
+      expect(json["error"]).to match(/Participant or assignment not found/)
+    end
+
+    it "returns 404 if assignment is not found" do
+      allow(Assignment).to receive(:find).with(assignment_id).and_raise(ActiveRecord::RecordNotFound)
+
+      get :get_review_tableau_data, params: { assignment_id: assignment_id, participant_id: participant_id }
+
+      expect(response).to have_http_status(:not_found)
+      json = JSON.parse(response.body)
+      expect(json["error"]).to match(/Participant or assignment not found/)
+    end
+
+    it "returns participant info correctly" do
+      get :get_review_tableau_data, params: { assignment_id: assignment_id, participant_id: participant_id }
+
+      json = JSON.parse(response.body)
+      participant_json = json["participant"]
+      expect(participant_json["id"]).to eq(fake_participant.id)
+      expect(participant_json["user_id"]).to eq(fake_participant.user_id)
+      expect(participant_json["user_name"]).to eq(fake_participant.user.name)
+      expect(participant_json["full_name"]).to eq(fake_participant.user.full_name)
+      expect(participant_json["handle"]).to eq(fake_participant.handle)
+    end
+
+    it "returns assignment info correctly" do
+      get :get_review_tableau_data, params: { assignment_id: assignment_id, participant_id: participant_id }
+
+      json = JSON.parse(response.body)
+      assignment_json = json["assignment"]
+      expect(assignment_json["id"]).to eq(assignment.id)
+      expect(assignment_json["name"]).to eq(assignment.name)
+    end
+
+    context "when user is a student (forbidden)" do
+      let(:student_user) { instance_double(User, id: 50, name: "StudentUser", full_name: "Student User", role_id: 1) }
+
+      before do
+        allow(controller).to receive(:current_user).and_return(student_user)
+        # allow(controller).to receive(:action_allowed?).and_return(false) # unauthorized
+        allow(controller).to receive(:authorize).and_call_original
+        allow(controller).to receive(:all_actions_allowed?).and_return(false)
+      end
+
+      it "returns 403 Unauthorized" do
+        get :get_review_tableau_data, params: { assignment_id: assignment_id, participant_id: participant_id }
+
+        expect(response).to have_http_status(:forbidden)
+
+        json = JSON.parse(response.body)
+        expect(json["error"]).to match(/You are not authorized to get_review_tableau_data this grades/)
+      end
+    end
+  end
+end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index 4e51c9933..a0794fd1b 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -78,7 +78,12 @@
 RSpec.configure do |config|
   # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
   # config.fixture_path = Rails.root.join('spec/fixtures')
-
+  if config.respond_to?(:fixture_paths=)
+    config.fixture_paths = [Rails.root.join('spec/fixtures').to_s]
+  else
+    # fallback for older Rails / rspec-rails
+    config.fixture_path = Rails.root.join('spec/fixtures')
+  end
   # Since we're using Factory Bot instead of fixtures, we don't need fixture_path
   # config.fixture_path is deprecated in newer RSpec versions anyway