diff --git a/paths/evaluate/evaluate.yml b/paths/evaluate/evaluate.yml
index ea197b2..12ae98f 100644
--- a/paths/evaluate/evaluate.yml
+++ b/paths/evaluate/evaluate.yml
@@ -366,6 +366,28 @@ post:
                 - feedbackId: "fb-2"
                   title: "Overall structure"
                   message: "The overall structure of your answer is clear and easy to follow."
+            mathExampleResponse:
+              summary: Example feedback response for a MATH submission with case matching
+              value:
+                - feedbackId: "fb-math-1"
+                  title: "Correct, matched expected case"
+                  message: "Your answer matches the expected simplified form."
+                  awardedPoints: 3
+                  response:
+                    latex: "x+y"
+                    sympy: "x + y"
+                  matchedCase: 0
+                  target:
+                    artefactType: "MATH"
+                    format: "latex"
+                - feedbackId: "fb-math-2"
+                  title: "No matching case"
+                  message: "We parsed your answer but it didn't match any of the known cases."
+                  awardedPoints: 0
+                  response:
+                    latex: "x-y"
+                    sympy: "x - y"
+                  matchedCase: null
     "202":
       $ref: "./responses/202-Accepted.yml"
     "400":
diff --git a/paths/evaluate/schemas/EvaluateRequest.yml b/paths/evaluate/schemas/EvaluateRequest.yml
index 044d459..7663078 100644
--- a/paths/evaluate/schemas/EvaluateRequest.yml
+++ b/paths/evaluate/schemas/EvaluateRequest.yml
@@ -34,7 +34,9 @@ properties:
   preSubmissionFeedback:
     description: >
       Optional settings for pre-submission feedback (non-final). When enabled,
-      the service should avoid committing or finalizing grades.
+      the service should avoid committing or finalizing grades. The resulting
+      preview content is returned via the response Feedback items' `response`
+      field.
     type:
       - object
       - "null"
diff --git a/paths/evaluate/schemas/Feedback.yml b/paths/evaluate/schemas/Feedback.yml
index d1d293a..f5fdbc3 100644
--- a/paths/evaluate/schemas/Feedback.yml
+++ b/paths/evaluate/schemas/Feedback.yml
@@ -1,8 +1,9 @@
 type: object
 description: >
   A single feedback item produced for the submission. It may include
-  suggested actions, optional points, optional criterion linkage, and
-  optional targeting into the submission.
+  suggested actions, optional points, optional criterion linkage, optional
+  targeting into the submission, optional normalized representation(s) of
+  the submission, and an optional matched-case index.
 properties:
   feedbackId:
     type: string
@@ -42,3 +43,26 @@ properties:
     description: Optional target reference inside the submission.
     allOf:
       - $ref: "./FeedbackTarget.yml"
+  response:
+    type:
+      - object
+      - "null"
+    description: >
+      Optional normalized representation(s) of the submission as interpreted
+      by the service (e.g., a parsed or simplified rendering), keyed by
+      format — for example { latex: "x+y", sympy: "x + y" }. Also used to
+      carry pre-submission preview content when the request's
+      preSubmissionFeedback.enabled was set to true.
+    allOf:
+      - $ref: "../../shared/schemas/FormattedContent.yml"
+  matchedCase:
+    type:
+      - integer
+      - "null"
+    format: int32
+    description: >
+      Optional index into a service-defined list of matching cases (e.g., a
+      Lambda Feedback-style "cases" list supplied under the request's
+      configuration object), when the service supports such a mechanism.
+      Null if no case matched. This is a provider-specific convention and is
+      not a formally defined construct in this spec.
diff --git a/paths/evaluate/schemas/PreSubmissionFeedback.yml b/paths/evaluate/schemas/PreSubmissionFeedback.yml
index 69abd63..b2302b4 100644
--- a/paths/evaluate/schemas/PreSubmissionFeedback.yml
+++ b/paths/evaluate/schemas/PreSubmissionFeedback.yml
@@ -1,5 +1,9 @@
 type: object
-description: Optional configuration for pre-submission feedback runs.
+description: >
+  Optional configuration for pre-submission feedback runs. This only toggles
+  the mode; the actual preview content (e.g., normalized representations of
+  the submission) is returned in the /evaluate response, via each feedback
+  item's `response` field (see Feedback.yml) — not on this schema.
 required:
   - enabled
 additionalProperties: true
diff --git a/paths/shared/schemas/FormattedContent.yml b/paths/shared/schemas/FormattedContent.yml
new file mode 100644
index 0000000..087af1e
--- /dev/null
+++ b/paths/shared/schemas/FormattedContent.yml
@@ -0,0 +1,9 @@
+type:
+  - object
+  - "null"
+description: >
+  A set of representations of the same underlying content, keyed by an
+  arbitrary format id (e.g. "latex", "sympy", "formatted", "ast"). The
+  set of keys is service-defined and not enumerated by this spec.
+additionalProperties:
+  type: string