Columbia has not come clean about they've given us no it no knowledge at all about the extent and this is the strength of this conspiracy but i think it's reasonable to assume that it may well have started maybe in the 90s. loren says what glumbia could do if they want to cheat without getting caught is just to play with three variables  the percentage of class sizes under 20 students, the percentage of class size over 50 students and the percentage of faculty that are full-time employees. The combination of those values gives us a rounded score of 92 which ties columbia with duke and north western for 10th place which is kind of what we were aiming