There is a glaring gap in teen pregnancy prevention efforts: information about how males could and should participate in programs to prevent teen pregnancy. This guide, funded by the California Wellness Foundation, fills that gap. The authors profile the male partners of teenage mothers to help planners understand the behaviors that need to be changed. They show planners how to get male teens involved through detailed descriptions of 24 of the nation's most promising prevention programs. Areas covered include the programs' funding and staffing, the barriers they have faced and overcome, and lessons they have learned about involving young men in their efforts.