Given a premise, retrieve a hypothesis that is entailed by the premise.However, case studies, like any other method GAO uses, have to meet two other criteria of  accuracy and lack of bias, in the sense that the evaluator's personal, preconceived opinions about a situation do not distort reporting and that the evaluator is scrupulously evenhanded in examining all sides of a situation.
There are two criteria relating to bias and accuracy that case studies have to meet.
Case studies do not have to meet any criteria for lack of bias.