Participation is a multifaceted term that includes different meanings, e.g., the right to participate in democracies or the participation of toddlers in gameplay (Kellett, 2009). As an overarching principle for the implementation and protection of all children’s rights, Article 12 of the UN CRC states that States Parties shall ensure that children and young people are heard and can express their views in all matters affecting them. Studies and meta-studies prove, especially for children and adolescents in out-of-home care, that this represents a particular challenge, on the one hand, and is an essential condition for successful care, on the other...