The Subject Category List presented was endorsed by the Committee on Scientific and Technical Information (COSATI) of the Federal Council on Science and Technology as a uniform subject arrangement for (1) the announcement and distribution of scientific and technical reports which are issued or sponsored by Executive Branch Agencies, and (2) for management reporting. The list is a two-level arrangement consisting of 22 major subject fields with a further subdivision of the fields into 178 groups. Scope notes are included for each group. Abstracts, citations and the like, for announcement purpose, can be gathered into these broad subject fields or groups for display to the user. For distribution purposes, these fields or groups may likewise be employed. Similarly, the fields or groups may be useful for arranging projects, tasks, or programs for management reporting purposes.