The document discusses the use of instructional media in learning. It notes that media should be used with guiding principles about how learners will use the experiences contained in the media. Without a theoretical rationale, using specific materials may become mechanical. The document also discusses developing conceptual bases for choosing media and materials based on the relationship between media, learning, and instruction. Finally, it notes that learning effectiveness depends not just on the selected media but also how the learner uses the presented information.