Important Update: STACK upgrade and its impact on existing questions

The STACK Moodle plugin is getting an upgrade!

What is STACK?
STACK is a powerful system for creating and managing online assessments in mathematics, science, and related disciplines. It’s integrated into our Moodle platform, providing a seamless experience for creating complex, auto-graded questions.

The new version, STACK 4.4, was initially released in July 2022 and is now being implemented in our Moodle platform on Tuesday 25th July. This major update focuses on enhancing the performance and overcoming limitations of the previous systems, particularly in the Potential Response Tree (PRT) and Computer Algebra System Text (CASText) systems.

However, it’s important to note that the new version of STACK has become more stringent in terms of logic and syntax. As a result, certain questions may not function as they did before. This is due to the enhanced logic/syntax checks incorporated in the new version, aimed at improving the accuracy and consistency of STACK assessments.

We have conducted tests and identified the questions that may be affected by this change. These are listed in a report on our wiki (you need to be logged in with your UCL account to view the report). We understand that this may require adjustments to your current questions and apologise for any inconvenience this may cause.
We recommend reviewing and updating your questions as necessary to ensure they function correctly after the upgrade.

To help you navigate these changes, you can review the list of key issues that might arise and their solutions in the Release Notes.

As always, we’re here to support you during this transition. If you have any questions or need assistance, please don’t hesitate to reach out to the Digital Education team.

Thank you for your understanding and cooperation as we work to improve our Moodle platform and assessment tools.