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.

Keller argued that effective instruction should incorporate five principles, the essential elements of the Keller Plan:

The Keller Plan has mainly been used in higher education, particularly as a more personalized form of instruction in large classes, but there is nothing inherent in Keller's formulation to restrict its application to particular grade levels, content, or types of courses. There has been a good deal of research on the effectiveness of PSI which indicated that it had robust, significantly positive on learning when compared to more traditional lecture-based formats.

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