This document discusses the development of self-learning materials (SLM). It defines SLM as learner-centered materials that serve as an in-built teacher for open distance learning (ODL) students. The document outlines the key characteristics of SLM, including being self-explanatory, self-contained, self-directed, self-motivating, self-evaluating and self-learning. It also compares SLM to traditional textbooks and describes the structure of SLM units according to IGNOU, including objectives, introduction, main body, activities, conclusion and references. The document provides guidance on writing objectives, developing content and includes examples of activities.