Results: Meta-CART identified the following most effective combinations: Provide information about behavior–health link with Prompt intention formation (mean effect size g ϭ 0.46), and Provide information about behavior–health link with Provide information on consequences and Use of follow-up prompts (g ϭ 0.44). Least effective interventions were those using Provide feedback on performance without using Provide instruction (g ϭ 0.05).