Assessments of consultants, clients, and consumer satisfaction were used to examine the effects of a competency-based consultation training program conducted over 4 years. Using a multiple-baseline framework to assess training effects on consultants and single-case study designs to evaluate changes in client behavior, a number of significant results were found. As predicted, consultants ( N = 24) significantly increased their consultation skills and knowledge, but with no change in attitudes toward behavioral intervention techniques. Supervised consultation with preschool teachers and parents resulted in a range of behavior change in clients ( N = 39), with an overall effect size of 0.51. Consumers reported a high level of satisfaction with training and consultation services. Results of a long-term follow-up with consultants indicated positive views and use of consultation. The discussion focuses on these results, and implications for consultation training and future research directions.