Advice on the selection of suitable instructional materials to support the chosen method(s) of instruction is offered in this booklet. The first of four sections takes a brief look at the different roles that instructional materials can play in the three main instructional modes--mass instruction, individualized learning, and group learning. The second section reviews seven different types of instructional materials, describing the main characteristics of the various members of each group: (1) printed and duplicated materials; (2) non-projected display materials; (3) still projected display materials; (4) audio materials; (5) linked audio and still visual materials; (6) cine and video materials; and (7) computer mediated materials. Factors to be considered when choosing materials for a specific instructional purpose are discussed in the third section, and the fourth looks at different possible ways of acquiring or producing materials of the required type. A flow chart for identifying possible materials for achieving specific objectives and a table summarizing characteristics of various types of materials are included, as well as an annotated list of booklets in this series that address the production of various types of media. (MES)