This document discusses several learning theories and perspectives: 1) The behavioral perspective focuses on observable behaviors and conditioned responses. Key theorists include Watson, Skinner, Pavlov, Hull, and Thorndike. 2) Instructional design based on the information processing perspective aims to optimize cognitive processes. 3) Constructivism emphasizes that learners construct their own understanding by combining new information with existing knowledge. 4) Communication theory models the transmission and interpretation of messages between people and through media channels.