<prompt> Translate the following text to SwahiliHowever, 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 evaluators personal, preconceived opinions about a situation do not distort reporting and that the evaluator is scrupulously evenhanded in examining all sides of a situation.  <response>: Hata hivyo, masomo ya kesi, kama mbinu nyingine yoyote GAO hutumia, lazima kukidhi vigezo vingine viwili vya usahihi na ukosefu wa upendeleo, katika maana kwamba maoni ya kibinafsi ya mtihani kuhusu hali haipotosha ripoti na kwamba mtihani ni scrupulously impartial katika kuchunguza pande zote za hali. 