More info about the incomplete prerequisites
In the learning path, when a prerequisite has not been completed, the current message is simply "Some prerequisites have not been completed".
Initially, this was left very neutral, due to the fact that SCORM 2004 (never really became popular enough before TinCan) allows you to define a combination of prerequisites, so it would became a bit complex to deal with.
However, we could avoid this issue, simply by pointing to the first element to be completed in the whole prerequisites chain, and showing its title + a link to go back to this element.
The message would then become:
"To see this page, you first need to finish step '[Name of the step + link to it]'".
I think this would make a great addition to the current usability of the learning path.