Cluster evaluation was developed to address certain outcome questions when multiple grants are awarded to address common problems and grantees are allowed to operationalise the problems independently, develop strategies to address the problems they define, and develop their own project evaluation plan. The basic element needed to make cluster evaluation work is collaboration - working together across all sites as a team of evaluators with a common goal and learning from everyone’s collective experiences. The key component of cluster evaluation has been networking conferences, during which information is shared and analysed by all of the grantees. They learn together as if they were in a course together in which cooperative learning was the instructional model.