https://www.edsurge.com/news/2020-06-16-what-a-forgotten-instructional-fad-from-the-60s-reveals-about-teaching

Back in the 1960s, an experimental form of teaching made a big splash at colleges. It was called PSI, or the Personalized System of Instruction. https://en.wikipedia.org/wiki/Keller_Plan

http://www.nwlink.com/~donclark/hrd/history/psi.html

https://www.researchgate.net/publication/26468339_The_Personalized_System_of_Instruction_Review_and_Applications_to_Distance_Education

the case that colleges should do more to professionalize teaching, which might help reduce the number of fads that emerge. But he also acknowledges that there are risks. “If you start creating elaborate bureaucracies to measure and judge [teaching], might you actually depersonalize it? Might you take some of the charisma, idiosyncrasy and serendipity out of it?”