Applied research is intended to provide practical information to organizations to suggest actions or increase effectiveness. It uses theory instrumentally to identify concepts and variables that will produce practical results. Evaluation research assesses the impact of programs, policies, or laws, often focusing on whether the intervention succeeded in creating intended changes. Different types of evaluation research include outcome evaluation, cost-benefit analysis, process evaluation, formative analysis, and needs assessments. Careful research design is needed to make causal claims about a program's effects. Participatory action research involves community members in the research process. Politics and organizational interests can influence evaluation findings and their use.