diff --git a/mod/quiz/classes/output/attempt_summary_information.php b/mod/quiz/classes/output/attempt_summary_information.php
index f271005ddb2..d5b66856731 100644
--- a/mod/quiz/classes/output/attempt_summary_information.php
+++ b/mod/quiz/classes/output/attempt_summary_information.php
@@ -61,6 +61,84 @@ class attempt_summary_information implements renderable, named_templatable {
         ];
     }
 
+    /**
+     * Add an item to the summary just before the given item.
+     *
+     * If that item is not present, then add as the first item.
+     *
+     * @param string $shortname unique identifier of this item (not displayed).
+     * @param string|renderable $title the title of this item.
+     * @param string|renderable $content the content of this item.
+     * @param string $addbefore identifier of the other item to add this before.
+     */
+    public function add_item_before(
+        string $shortname,
+        string|renderable $title,
+        string|renderable $content,
+        string $addbefore,
+    ): void {
+        $position = array_search($addbefore, array_keys($this->summarydata));
+        if ($position !== false) {
+            $this->insert_new_item_at_position($shortname, $title, $content, $position);
+        } else {
+            $this->insert_new_item_at_position($shortname, $title, $content, 0);
+        }
+    }
+
+    /**
+     * Add an item to the summary just after the given item.
+     *
+     * If that item is not present, then just add at the end.
+     *
+     * @param string $shortname unique identifier of this item (not displayed).
+     * @param string|renderable $title the title of this item.
+     * @param string|renderable $content the content of this item.
+     * @param string $addafter identifier of the other item to add this before.
+     */
+    public function add_item_after(
+        string $shortname,
+        string|renderable $title,
+        string|renderable $content,
+        string $addafter,
+    ): void {
+        $position = array_search($addafter, array_keys($this->summarydata));
+        if ($position !== false) {
+            $this->insert_new_item_at_position($shortname, $title, $content, $position + 1);
+        } else {
+            $this->add_item($shortname, $title, $content);
+        }
+    }
+
+    /**
+     * Add an item to the summary just before the given position.
+     *
+     * @param string $shortname unique identifier of this item (not displayed).
+     * @param string|renderable $title the title of this item.
+     * @param string|renderable $content the content of this item.
+     * @param int $position Numerical position to insert the item at. 0 means first.
+     */
+    protected function insert_new_item_at_position(
+        string $shortname,
+        string|renderable $title,
+        string|renderable $content,
+        int $position,
+    ) {
+        $this->summarydata = array_merge(
+            array_slice($this->summarydata, 0, $position),
+            [$shortname => ['title' => $title, 'content' => $content]],
+            array_slice($this->summarydata, $position, count($this->summarydata)),
+        );
+    }
+
+    /**
+     * Remove an item, if present.
+     *
+     * @param string $shortname
+     */
+    public function remove_item(string $shortname): void {
+        unset($this->summarydata[$shortname]);
+    }
+
     /**
      * Filter the data held, to keep only the information with the given shortnames.
      *
diff --git a/mod/quiz/tests/output/attempt_summary_information_test.php b/mod/quiz/tests/output/attempt_summary_information_test.php
new file mode 100644
index 00000000000..232058218af
--- /dev/null
+++ b/mod/quiz/tests/output/attempt_summary_information_test.php
@@ -0,0 +1,193 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace mod_quiz\output;
+
+use advanced_testcase;
+
+/**
+ * Tests for {@see attempt_summary_information}.
+ *
+ * @package   mod_quiz
+ * @copyright The Open University
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @covers    \mod_quiz\output\attempt_summary_information
+ */
+final class attempt_summary_information_test extends advanced_testcase {
+
+    public function test_add_item(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('test', 'Test name', 'Test value');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'Test name', 'content' => 'Test value'],
+        ], $data['items']);
+    }
+
+    public function test_add_item_before_start(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('test', 'Test name', 'Test value');
+
+        $summary->add_item_before('newitem', 'New name', 'New value', 'test');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'New name', 'content' => 'New value'],
+            (object) ['title' => 'Test name', 'content' => 'Test value'],
+        ], $data['items']);
+    }
+
+    public function test_add_item_before_middle(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('item1', 'Existing 1', 'One');
+        $summary->add_item('item2', 'Existing 2', 'Two');
+
+        $summary->add_item_before('newitem', 'New name', 'New value', 'item2');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'Existing 1', 'content' => 'One'],
+            (object) ['title' => 'New name', 'content' => 'New value'],
+            (object) ['title' => 'Existing 2', 'content' => 'Two'],
+        ], $data['items']);
+    }
+
+    public function test_add_item_before_no_match(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('test', 'Test name', 'Test value');
+
+        $summary->add_item_before('newitem', 'New name', 'New value', 'unknown');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'New name', 'content' => 'New value'],
+            (object) ['title' => 'Test name', 'content' => 'Test value'],
+        ], $data['items']);
+    }
+
+    public function test_add_item_before_empty(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+
+        $summary->add_item_before('newitem', 'New name', 'New value', 'unknown');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'New name', 'content' => 'New value'],
+        ], $data['items']);
+    }
+
+    public function test_add_item_after_end(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('test', 'Test name', 'Test value');
+
+        $summary->add_item_after('newitem', 'New name', 'New value', 'test');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'Test name', 'content' => 'Test value'],
+            (object) ['title' => 'New name', 'content' => 'New value'],
+        ], $data['items']);
+    }
+
+    public function test_add_item_after_middle(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('item1', 'Existing 1', 'One');
+        $summary->add_item('item2', 'Existing 2', 'Two');
+
+        $summary->add_item_after('newitem', 'New name', 'New value', 'item1');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'Existing 1', 'content' => 'One'],
+            (object) ['title' => 'New name', 'content' => 'New value'],
+            (object) ['title' => 'Existing 2', 'content' => 'Two'],
+        ], $data['items']);
+    }
+
+    public function test_add_item_after_no_match(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('test', 'Test name', 'Test value');
+
+        $summary->add_item_after('newitem', 'New name', 'New value', 'unknown');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'Test name', 'content' => 'Test value'],
+            (object) ['title' => 'New name', 'content' => 'New value'],
+        ], $data['items']);
+    }
+
+    public function test_add_item_after_empty(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+
+        $summary->add_item_after('newitem', 'New name', 'New value', 'unknown');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'New name', 'content' => 'New value'],
+        ], $data['items']);
+    }
+
+    public function test_remove_item(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('item1', 'Existing 1', 'One');
+        $summary->add_item('item2', 'Existing 2', 'Two');
+
+        $summary->remove_item('item1');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'Existing 2', 'content' => 'Two'],
+        ], $data['items']);
+    }
+
+    public function test_remove_item_not_present(): void {
+        global $PAGE;
+
+        $summary = new attempt_summary_information();
+        $summary->add_item('item1', 'Existing 1', 'One');
+        $summary->add_item('item2', 'Existing 2', 'Two');
+
+        $summary->remove_item('item3');
+
+        $data = $summary->export_for_template($PAGE->get_renderer('mod_quiz'));
+        $this->assertEquals([
+            (object) ['title' => 'Existing 1', 'content' => 'One'],
+            (object) ['title' => 'Existing 2', 'content' => 'Two'],
+        ], $data['items']);
+    }
+}