<prompt> Translate the following text to SwahiliAlmost 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.  <response>: Karibu 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. 