**20. Evaluating the policy or program**

Simply put, evaluation is a work experiment that has achieved policy goals as well as program objectives. After established research design, many public/ environmental health policies as well as programs are frequently examined using a "quasiexperimental" designs (i.e., people lacking haphazard assignment toward intervention as well as comparison groups). Generally, the strongest appraisal designs recognize the roles of both parametric as well as non-parametric evaluation. In addition, evaluation designs tool must be flexible as well as sensitive enough toward measuring average variability, even individuals falling short of behavioral changes. Genuine variables take incremental place over time, in many ways frequently not known toward those individuals closest to the intervention.
