 Keller Plan

The Keller Plan, also called the Personalized System of Instruction (PSI), was developed by Fred S. Keller with J. Gilmour Sherman, Carolina Bori, and Rodolpho Azzi in the middle 1960s as an innovative method of instruction for the then-new University of Brasília.PSI was conceived of as an application of Skinner's theories of learning, grounded in operant conditioning strategies of behaviorism.