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Fragment
A fragment is a time range inside a video. It has a start time and an end time. You can hold a whole workspace to one fragment, or hold one module to it. Times outside the fragment then stay out of the counts.
Example: A lesson lasts 50 minutes, but you study only the group work. That part runs from 12:00 to 16:00. You set a fragment with those 2 times. Every chart then counts the group work alone.
Why it matters in GRAPE MARS
Set the start time and the end time under Fragment, in the bar above your charts. Every module on the page then counts that slice alone, because the fragment is part of the scope. It lets you compare the same 4 minutes across 2 videos, or split one long class into phases.