Programmed instruction
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Programmed instruction is a field first studied extensively by the behaviorist B.F. Skinner. It consists of self-teaching with the aid of a textbook or teaching machine that presents material structured in a logical sequence. Programmed instruction allows students to answer questions about a unit of study at their own rate, checking their own answers and advancing only after answering correctly. After each step, they are presented with a question to test their comprehension, then are immediately shown the correct answer or given additional information. This idea was later adapted by Robert M. Gagné, who invented programmed learning for use in teaching in schools. The difference between programmed instruction (PI) and programmed learning (PL) is that PI is intended to modify behavior, whereas PL is used for teaching facts and skills. The Keller Plan, named for Fred S. Keller, was a famous idea for how to incorporate programmed learning into the classroom.