Group-based is defined as two or more individuals (whether identified or not) who are known to (or associated with) one another and are known to be involved in or to facilitate the sexual exploitation of children. Being involved in the sexual exploitation of children includes e.g. introducing them to other individuals for the purpose of exploitation, trafficking a child for the purpose of sexual exploitation, taking payment for sexual activities with a child or allowing their property to be used for sexual activities with a child, etc. This can be perpetrated within or beyond the family, by both children and adults, and groups can be organised or loosely linked.