Assertive community treatment (ACT), is an intensive and highly integrated approach for community mental health service delivery. ACT programs serve outpatients whose symptoms of mental illness result in serious functioning difficulties in several major areas of life, often including work, social relationships, residential independence, and physical health. In Denmark ACT has been tested among psychiatric patients and homeless citizens. In the present study the method will be implemented in two municipalities and tested among citizens who suffer from mental disorder as well as substance abuse. SFI together with Rambøll, will evaluate the ACT program in the two municipalities. The overall goal of the ACT method is to improve the citizens opportunities to getting started on an education and in the long run be a part of the labour market. The evaluation includes a qualitative and a quantitative part. The qualitative part includes interviews with the social workers to study the implementation of the ACT method in the municipalities. The quantitative part is based on questionnaire surveys and register data.