The document discusses key principles of media theory for instructional design. It outlines that the value of media in learning depends on how realistic the experiences feel and that concrete experiences aid abstract understanding. Learning increases with more audio and visual stimuli. Visual information is retained more than verbal information as it uses both visual and verbal memory. Media selection should consider learner and content characteristics. Foundational research discussed includes Skinner's work on reinforcement and Paivo's dual coding theory. Early contributors to the field are also noted.