Recognising the pivotal role, played by criminal justice authorities in identifying and deciding on the most appropriate course of action in situations, involving offenders with intellectual or psychosocial disabilities, this methodology is intended as an introduction to working with such individuals. It covers the essential information to help authorities identify this group of people. Criminal justice staff are not expected to formally assess or diagnose offenders they are working with. Instead, they are expected to be alert when coming into contact with such a person, that there might be a problem, that would require some special attention and initiate a specialist assessment. The sole purpose of this methodology is to serve as an additional source of information, which could be taken into account when making a decision concerning the accused person.