<prompt> Translate the following text to EnglishKatika sura hii, tutazungumzia mambo mawili ya msingi ambayo tunahitaji kuzingatia kuhusu usawa wa masomo ya kesi na uwezekano wao wa kuelezea.  <response>: chapter, we turn to two basic What do we need to take into account with regard to the objectivity of case studies and their generalizability? 