This description of the System for Automated Typesetting (SCAT), an automated system for typesetting text and inserting special graphic symbols in programmed instructional materials created by the computer aided authoring system AUTHOR, provides an outline of the design architecture of the system and an overview including the component requirements, a flow chart and examples of system input data, composed text stream, and typeset output. The technical approach employed in developing SCAT and the rationale used in making the software and format decisions are reviewed, and a brief discussion of the important factors involved in the use of such a system for the preparation of computer authored programmed instructions is followed by recommendations. A glossary is provided, as well as five appendices containing listings of programs used by SCAT, typographer's substitution tables, a SCAT user's guide, code sets, and a sample of programmed instruction demonstrating the use of typography. (CHC)