<prompt> Translate the following text to SwahiliSometimes, however, it is not possible to answer the evaluation question using case studies, if the program is diverse and the user needs national generalizability.  <response>: Wakati mwingine, hata hivyo, haiwezekani kujibu swali la tathmini kwa kutumia masomo ya kesi, ikiwa programu ni tofauti na mtumiaji anahitaji jumla ya kitaifa. 