Next: News on the ISOPHOT Interactive Analysis PIA . Up: Data Analysis Applications . ... We briefly describe the ISO Spectral Analysis Package ISAP. ... ISAP is written in pure IDL. Its command line mode as well as the widget based graphical user interface (GUI) are designed to provide ISO observers with a convenient and powerful tool to cope with data of a very complex character and structure. ... The ISO Spectral Analysis Package, ISAP, plays an important role in ISO data analysis. ...