This document discusses what makes a good educational film and why they are important. It begins by quoting the founding president of Stanford University in 1919 who said educational motion pictures would mean "vividness where vagueness has reigned". It then discusses cognitive learning theories like long term memory, working memory, schemas and cognitive load theory that inform how educational videos should be designed. Specifically, it discusses Mayer's theory of multimedia learning which says videos should reduce extraneous processing, manage essential processing and foster generative processing. It provides some examples of techniques to achieve this like signaling important information, segmenting content into chunks, and weeding out extraneous information. The document references several experts in the field of educational video design.