This document discusses supplementary learning materials (SLM) as tools to enhance teaching and meet learners' needs, emphasizing that they should complement primary instructional resources rather than replace them. It outlines reasons for using SLM, such as addressing gaps in course materials, tailoring to specific learner interests, and adding variety to instruction. Additionally, it provides considerations for selecting effective SLM and lists various types of SLM, including digital resources and manipulatives.