The document discusses the Personalized System of Instruction (PSI), a self-learning technique developed by F.S. Killer. PSI emphasizes individualized instruction without classroom teaching. The PSI teacher manages the course and creates a cooperative environment, while the instructor designs instruction materials. Proctors, who are bright students, guide and motivate other learners. PSI uses mastery-based, self-paced study with print guides and feedback from peers. Students learn units individually with proctor help. PSI can increase independent learning, self-paced progress, and interaction, but preparing materials and ensuring consistent work can be difficult.