Most research on adventure therapy as a therapeutic intervention has focused on aspects of cooperation and trust, and other research examines therapeutic techniques with adventure therapy or outcomes on pathology. Further inquiry into the standards, requirements, education, and training for individuals conducting adventure therapy is needed. In a meta-analysis aimed at statistically integrating all the available empirical research on adventure therapy, only 43 studies in a 25-year span were found to fit the criteria for analysis. The authors of that meta-analysis report that the limited number of studies demonstrates the limitations in the research on adventure programming.