Lessons learned in the Multisite Violence Prevention Project collaboration: big questions require large efforts.

This paper summarizes some organizational, scientific, and policy lessons that have emerged in the formation and conducting of the collaboration of the Multisite Violence Prevention Project. We contend that these lessons are valuable for other collaborations and are important for furthering the utility of scientific efforts. A central contention is that large-scale efforts such as this collaboration are underused but are essential for efficient advancement of knowledge about preventing youth violence.