The field of Speaker Identification in forensic is one of the oldest application of speech science. Listening test and spectrogram reading have been the most popular approach in this specific task for many years. We introduce a method based on the comparison of vowel formant, and we describe the associated software tools that let you easily perform a complete speaker identification test: starting from speech acquisition and ending with a report on statistical tests. The system has been designed to run on a small computer, and in a user-friendly environment. After a first release of IDEM in 1991[1] we have now reached a (almost) errors free and "end-user" robust version of the system. We base our corrections and improvements of the system on our own experience in this field, and on the suggestions of real users, i.e. of several police investigation bureau that extensively use the IDEM system.