How is it determined which cohort a student is in? Is it when they started the program, when they finally complete the program or when they take the test?

The cohorts are “admission cohorts;” when the student is actually admitted to the program.   Each cohort will have an on-time graduation.  IF a student needs extended time and will not graduate until the next year, they remain with the original cohort and you (as Program Director) will have the ability to manually put in the actual graduation date.