<prompt> Translate the following text to EnglishKaribu kila mtu katika GAO labda amefanya kazi kwenye utafiti wa kesi wakati mmoja au mwingine lakini anaweza kuwa hajui nini inamaanisha, kwa njia, na utafiti wa kesi.  <response>: Almost everyone in GAO probably has worked on a case study at one time or another yet may be unfamiliar with what is meant, methodologically, by a case study. 