<prompt> Translate the following text to EnglishSasa tuzungumzie mambo mengine ambayo hutofautisha utafiti wa kesi kutoka kwa utafiti wa kesi isiyo na utafiti wa kesi nzuri kutoka kwa utafiti wa kesi isiyo nzuri.  <response>: We turn now to other elements that distinguish a case study from a not-case study and a good case study from a not-good case study. 