Presented is the first in a series of four hearings on international cooperation in science. The focus of the hearing is international cooperation in big science, as personified by the field of high energy physics. The particular area of interest is the questions: What are the past experience and future prospects for international costsharing of the next generation of high energy physics facilities, both in terms of construction and in operation? Witnesses providing testimony and/or prepared statements concerning this question and related issues include: Satoshi Ozaki; Volker Soergel; Giorgio Brianti; James E. Leiss; Jean Sacton; and Broyce D. McDaniel. Appendices include: (1) witnesses' questions and answers for the record; (2) discussants' questions and answers for the record (discussants are Leon M. Lederman, Nicholas P. Samios, Burton Richter, Jack Sandweiss, and Maury Tigner); (3) additional statements for the record (including those by Nicholas P. Samios and Peter McIntyre); and (4) supporting documentation (including various types of annual reports related to the issues addressed). (JN)