This document discusses programmed instruction, which is a method of teaching that presents information in discrete units requiring a correct response before advancing. It describes the key features as clearly stated objectives, small frames of instruction, and self-pacing. The principles are determining the desired behavior, providing immediate feedback, self-learning at one's own speed, and active participation. The importance is that it shifted education's focus to outcomes, demonstrated self-pacing and mastery learning, required well-constructed materials, and drew new professionals to the field.