Families are increasingly involved in the implementation of behavior support interventions to promote positive behaviors of young children in everyday family settings. Contextual fit, described as congruence between the behavior support intervention and the values, skills, resources, and routines of those who will implement the intervention, has been associated with the effectiveness and sustainability of the intervention. We analyzed studies published in the "Journal of Positive Behavior Interventions" from 1999 to 2009 in which families of young children ages 3 through 8 years implemented behavior support interventions. As part of this review, we examined information reported about contextual fit. Eighteen studies met the inclusion criteria and were coded using an investigator-developed protocol. Findings revealed that researchers generally reported information about collaborative partnerships with families. Information about family ecology, cultural and linguistic background, family perspectives about the intervention, and family quality of life were not reported in the majority of studies reviewed. Recommendations related to future reporting practices and research focused on contextual fit are discussed. (Contains 2 tables.)