This document discusses revising instructional materials to improve student learning. It recommends that teachers examine pre-tests and post-tests to identify gaps in student understanding and weaknesses in instructional materials. The document then provides examples of different types of instructional materials like distance education, computer-based instruction, and self-instructional materials. It offers guidance on analyzing student performance data from trials of instructional materials and determining what types of revisions are needed to content, procedures, or instructor-led materials to improve student outcomes.