This report provides a distribution of research and development (R&D) programs by the function of the Federal budget. It includes only Federal funding of R&D programs, with R&D facilities and all non-R&D activities excluded. The sections of the report are presented in descending order of R&D budget authority for the various functions in the fiscal year 1988 budget. (All the data in this report are based on budget authority dollars rather than obligations or outlays, since budget authority is the basis for congressional funding decisions.) Areas of R&D addressed in the sections are: (1) national defense; (2) health; (3) space research and technology; (4) general science; (5) energy; (6) natural resources and environment; (7) transportation; (8) agriculture; (9) international affairs; (10) education, training, employment, and social services; (11) veterans benefits; and (12) other functions. Each section provides an overview of the function and a summary table, followed by detailed tables and text describing the major R&D program areas within the function. Over 500 R&D programs are identified with their actual budget authority levels for fiscal year 1986, estimated levels for fiscal year 1987, and proposed funding levels for fiscal year 1988. (TW)