The present study addresses the significance of self-determination, integration and inclusion of persons with mental and/or multiple disability and entails an empirical study carried out to establish the individual care requirements of persons with special needs. The theoretical component is concerned, as an introduction, with the term (general and mental) disability, advancing through the various concepts such as the normalisation principle, empowerment, self-determination, participation, integration and inclusion as far as disability and habitation. Thereafter, methods for promoting independence and self-determination are discussed and as a consequence the Disabilities Act of Styria and its regulations in respect of the living conditions of persons with disabilities are scrutinised. A description of the services and benefits ordinance (LEVO) and the ICF leads to the introduction of the empirical component of the study. The assessment sheet, which is used as the basis for establishing the individual care requirements of persons with mental and/or multiple disabilities in Styria and is anchored in the LEVO, is examined for its internal consistency and construct validity in the empirical component, based on data from the 1991 assessment. To this aim, correlation analyses as well as scale and factor analyses have been performed. The results permit an estimation of reliability within the context of the internal consistency of the integrated scales as well as an overview of the application of the items within the framework of the assessment, and of their frequency of problem-solving and discriminatory powers. On this basis, less suitable items can be filtered out and proposals made for possible revision, condensation and improvement of the application of the classification procedure. Ultimately, the results of the factor analyses are also discussed in relation to the construct validity of the procedure.