Abstract
Japanese Evaluated Nuclear Data Library(JENDL)has been developed by Japanese Nuclear Data Committee and JAERI Nuclear Data Center. The first version of JENDL, JENDL-1, which was released in 1977, has been compiled to use mainly for fast, reactor development. The second version, JENDL-2 has aimed for use in wider fields including fusion researches, shielding calculations, etc., and its compilation is in progress. As our further step we now have a plan for the compilation of JENDL-3. The outline of JENDL-3 is described in terms of its features and the user's needs as well as the history of JENDL.