Positive behavior support is an effective and proactive approach for resolving serious problem behaviors that has been recommended by a growing number of professionals, advocates, policies, and laws. Building the capacity of educators and other professionals to provide positive behavior support is a vital concern as schools and community agencies serve increasingly diverse populations that include children and youth with disabilities and problem behaviors. This article describes issues and essential elements for building such capacity through inservice training. A core curriculum is outlined, and a national exemplar of comprehensive inservice training is described. Essential features of training that are needed for the development of practical skills are discussed.