4 Navigation
One of our first developments was to improve the navigation around a quiz with better signposting to the student of where they were and where they could go together with a visual record of where they had been. The new navigation was unashamedly lifted from Sam Marshall's navigation panel for OpenMark. The resulting Questions panel has been in use in OU Moodle since 2008 and was introduced to Moodle core in Moodle 2.0.
The image below also shows that at the OU we had Interactive with multiple tries behaviour running some years before it was included in Moodle core.
3 Question behaviours