> Out of curiosity, how does moodle define "complete"?
If you look at Quiz Administration > Edit Settings, you'll find these settings under "Activity Completion":
Next week, Moodle 2.7.1 will be released and you may see two more options added:
[X] When they get a passing grade [X] or When all of the available attempts are used (meaning they WON'T pass)
(That's an option I added, but it's awaiting final approval by Tim and the integrator, so it may or may not make it in time.)
All the different types of activities have at least the same completion options that Quiz has. Some types, such as SCORM, allow you to select other options as well.
For information about setting completion options, see:
http://docs.moodle.org/27/en/Activity_completion
For nitty-gritty technical details, see: