In this meta-analysis we asked the following questions: 1. How effective have interventions for parents of children with developmental disabilities been in reducing psychological distress in group comparison studies? 2. Are multicomponent training (MCT) interventions significantly more effective than either behavioral parent training (BPT) or cognitive behavioral, coping skills, training (CBT) alone? 3. Is there evidence to support the contention that parenting education or other forms of professionally-led psychoeducation increase stress? 4. Using APA guidelines, do these interventions meet criteria for evidence-based treatments or are they best considered as probably efficacious or as yet unproven?