@gdlt234 - Exactly. They do track 4 year rates as well at the Dept. of Educ. but it is generally agreed that this is not the best thing to look at. While most degrees are conventionally set to be achieved in 4 years, there are several that are set at 5. For either track, when you take into account the fact that people change majors, take a year off for any number of reasons, and other assorted “life happens” reasons, the 6 year metric is considered indicative of the propensity of students that start at any given school to finish with a degree of at least a bachelors at that same school.