These hearings on international cooperation in science focused on three issues: (1) international cooperation in big science; (2) the impact of international cooperation on research priorities; and (3) coordination in management of international cooperative research. Witnesses presenting testimony and/or prepared statements were: Victor Weisskopf; Sandra D. Toye; Walter A. McDougall; Harold Jaffe; Herbert Friedman; Joseph G. Gavin, Jr.; H. Guyford Stever; Kenneth S. Pedersen; John P. McTague (accompanied by Wallace Kornack); Charles Horner (accompanied by Jack Blanchard); John F. Clarke; Eugene Skolnikoff; and Hans-Otto Wuster. Witnesses' questions and answers are also included. Two appendices are provided. The first is the record of the briefing of the task force staff by the American Association for the Advancement of Science Consortium of Affiliates for International Programs (with these participants: Richard D. Anderson, Rita R. Colwell, Irving Engelson, Wayne Holtzman, Bryant W. Rossiter, and David S. Wiley). The second appendix (which comprises a major portion of the hearings record) is a compilation of supporting documentation. (JN)