NSF contracted with Abt Associates to conduct an evaluation of the EAPSI program to investigate whether it was meeting its goal of providing U.S. graduate students with international experiences that will enable future collaboration with foreign peers. This report summarizes the findings from that evaluation, which was designed to investigate the characteristics of EAPSI applicants and their motivations for participation, the host researchers’ motivations for participating in the program, participants’ experiences in and perceptions of the program, and outcomes of the program.