This Report shows the magnitude and complexity of violence in U.S. society, explicates the important ways that social science has already contributed knowledge, and sets forth a challenging set of research directions. The Report makes clear the need for a sustained violence initiative to produce fundamental research. Federal support for a major initiative requires an examination of priorities for allocating scarce resources. Across the landscape of serious issues where serious science must be done, research on violence should be enlarged. Increased funding for a national violence initiative now can enhance the quality of life and produce real savings in human and social costs well into the future.