The Symposium on Phase Change Oriented Science, started at Morioka in Iwate-ken in 1990, will greet the 26th meeting this year. This Symposium provides you an opportunity to collectively discuss the advance of Phase change recording technology for each year regarding the crystallization mechanism, recording material, structure, device and application about recording in the Phase change method, etc.

　Wide Phase change phenomena including the Phase change non-volatile memory (Ovonic memory and PRAM), which is the beginning of the Phase change research, is also put in view. In a couple of year, photon mode phase change phenomenon supported by experimental results is becoming one of new interpretations of phase change mechanism.