Descriptions of essential computer elements, logic and programing techniques, and computer applications are provided in an introductory handbook for use by educators and students. Following a brief historical perspective, the organization of a computer system is schematically illustrated, functions of components are explained in non-technical terms, and logic and programing techniques are exemplified with the aid of a "computer motel" analogy. A subsequent review of computer system applications in science, business, and education provides a detailed consideration of computer-assisted instruction. Final comments on future roles of the computer and social and cultural implications complete the presentation. The handbook maintains simplicity in exposition and is intended to facilitate understanding and acceptance of changes resulting from applications of computer technology in education. (SS)