The PRISM project in Japan to consider a high-intensity low-energy muon source is discussed. PRISM would include solenoid pion capture and phase rotation to create a muon beam of1012&mgr;±/secwith high purity and small energy spread, if it is combined with the planned 50-GeV proton synchrotron in the KEK/JAERI Joint Project. The PRISM could be extended to a front end of a neutrino factory in the future. ©2000 American Institute of Physics.