ASAP (Analysis System for Astrophysical Plasmas), developed at the Oss
ervatorio Astronomico di Palermo, is a package of procedures based on
IDL. It is aimed at the detailed presentation of theoretical models of
astrophysical plasmas and the accurate comparison with observational
data, up to fittings of specific observations. It is also useful for t
he prediction of specific observations, and for the simulation of the
expected performances of forthcoming instruments, for instance those o
n board SOHO.