KEK, the High Energy Accelerator Research Organization, is one of the world's leading accelerator science research laboratories, using high-energy particle beams and synchrotron light sources to probe the fundamental properties of matter. This program provides opportunities for students and young post-docs mainly from abroad to stay at KEK Tsukuba campus and to experience research at KEK. The participants belong to one of the research groups at KEK, and perform research work under the supervision of researchers in that group.