Keller's Personalized System of Instruction features which of the following characteristics?

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Keller's Personalized System of Instruction (PSI) is characterized by mastery learning, self-paced progress, reading materials, proctors, and optional lectures. Students must demonstrate mastery before moving on to the next unit or module, and they can move at their own pace through the materials. Reading materials are provided, and proctors are available to answer questions and provide guidance. Optional lectures may also be offered for students who want additional instruction or support.

Keller's Personalized System of Instruction Features Which of the Following