diff --git a/question.php b/question.php
index 57a1da0..da496b5 100644
--- a/question.php
+++ b/question.php
@@ -24,8 +24,8 @@
 
 use qtype_questionpy\api\api;
 use qtype_questionpy\api\attempt_ui;
-use qtype_questionpy\constants;
 use qtype_questionpy\api\scoring_code;
+use qtype_questionpy\constants;
 use qtype_questionpy\question_ui_metadata_extractor;
 use qtype_questionpy\utils;
 
@@ -267,7 +267,7 @@ public function is_complete_response(array $response): bool {
     }
 
     /**
-     * Use by many of the behaviours to determine whether the student's
+     * Used by many of the behaviours to determine whether the student's
      * response has changed. This is normally used to determine that a new set
      * of responses can safely be discarded.
      *
@@ -277,8 +277,10 @@ public function is_complete_response(array $response): bool {
      * @return bool whether the two sets of responses are the same - that is
      *                            whether the new set of responses can safely be discarded.
      */
-    public function is_same_response(array $prevresponse, array $newresponse) {
-        return false;
+    public function is_same_response(array $prevresponse, array $newresponse): bool {
+        /* The response has already been filtered against get_expected_data, we just need to filter out attempt state
+           and scoring state before comparing. */
+        return $newresponse == array_filter($prevresponse, fn($key) => !str_starts_with($key, "_"), ARRAY_FILTER_USE_KEY);
     }
 
     /**