FOI has developed a computer-based instrument for evaluation of Rescue Services preparedness for chemical accidents. The instrument is intended for studying the rescue services preparedness for accidents involving hazardous materials. The results can be used for discussions in order to improve that very preparedness. The document is a manual for users of the instrument, which is based on the method "Morphological Analysis" together with the program CASPER (Computer Aided Scenario and Problem Evaluation Routine).