He has focused and written extensively in the areas of public policy, program evaluation research, social intervention, and field research methodology. (preventionresearch.org)
Some of the approaches are «evidence - based,» meaning they have been the subject of evaluation research that can support causal conclusions about their effectiveness. (educationnext.org)
Perhaps the central challenge in evaluation research is to identify a plausible comparison group that was unaffected by the intervention under study. (educationnext.org)