The Keller Plan (also called The Personalized System of Instruction) is an instructional method introduced by Fred Keller, J. Gilmour Sherman, and other researchers in the 1960s.¹⁾ This individualized learning method was oriented on improvement of high school learning.

The key aspects of Keller's method are the following:²⁾

• The go-at-your-own-pace feature, which permits a student to move through the course at a speed commensurate with his ability and other demands upon his time.
• The unit-perfection requirement for advance, which lets the student go ahead to new material only after demonstrating mastery of that which preceded.
• The related stress upon the written word in teacher-student communication.
• The use of proctors, which permits repeated testing, immediate scoring, almost unavoidable tutoring, and a marked enhancement of the personal-social aspect of the educational process.