This document discusses the role of instructional materials and textbook evaluation. It provides definitions of textbooks and instructional materials. Textbooks can serve several roles, such as a resource for teaching, a source of activities and information for learners, and a support for less experienced teachers. When evaluating textbooks, it is important to consider the needs of learners, teachers, and the language program. Some criteria for evaluation include how well the textbook corresponds to learners' needs and reflects their purposes, accounts for their needs as learners, and supports the learning process.