The aim of this study was to investigate how organizational and child-related factors, as well as the general approach, affect the child's participation and the extent to which children are involved in the child protection agency child care investigations. Based on the following questions, the study investigated to which extent, and in which way, children are involved in investigations: 1. To what extent and in what way are children involved in the Swedish child protection agency? 2. How are children's involvement affected of child-related factors? 3. How are children's involvement affected of organizational factors? The result has been analyzed based on Michael Lipsky's Street-level-bureaucracy (2010), in addition, Harry Shier`s (2001) participation ladder has also been used. The result showed that most of social workers considered that the factors of time, workload, competence development and staff density affects children's participation. Drawing on the answers from the study, we conclude that there is generally a high level of participation within the Swedish child protection agency. Children hold a significant place in social welfare investigation cases, although social workers could involve them to a greater extent in the decision making process.