This document provides an overview of the history and evolution of educational technology. It traces the roots of instructional design back to thinkers like Socrates, Plato, and Aristotle, as well as early 20th century scholars like Edward Thorndike, B.F. Skinner, and Robert Gagne who developed theories of behaviorism and cognitive learning. More recent developments include the establishment of the Association for Educational Communications and Technology in 1977 and models for analyzing, designing, developing, implementing and evaluating educational resources and technologies. The document encourages readers to learn more through referenced websites and contacts people with any additional questions.