"Individual modules" refers to separate parts or components that can function on their own, but can also be combined together to build a larger system or structure. Full definition
The modular design further allows convenient replacement of individual modules when necessary. (sciencedaily.com)
Users can obtain certificates for individual modules or for completing the full training program by passing quizzes that are built into the system. (zerotothree.org)
Another indicator of student engagement is to look at how much time your students spend on individual modules. (elearningindustry.com)