The article describes and analyses some preliminary working methods for user involvement in child welfare. The models are based on the results of a national project in Sweden where children and young people have been involved as informants. How experiences and viewpoints from children and young people can be a source of knowledge in child welfare organisations is one of the main questions. The performance and the results of the project are analysed in relation to a theoretical macro-oriented model created to illustrate the need for different kinds of knowledge in supporting the implementation of an evidence-based practice.