We use a case study to illustrate how challenging it can be to apply rigorous evaluation procedures of environmental education programs in a real world setting. We report here our experiences in conducting 2 major evaluations. In Case Number 1, the identity of the client is not disclosed for reasons that will become obvious. This client was a national, non-profit conservation organization that requested an independent evaluation of an educational program designed for volunteer use. Case Number 2 reviews the evaluation of the Virginia Hunter Education program conducted in the early 1980s.