<prompt> Translate the following text to EnglishKwa kuongezea, mtihani anaweza kutumia njia ya uchunguzi wa kesi ili kuongeza jumla ya matokeo na anaweza kuchanganya masomo ya kesi na mbinu zingine.  <response>: In addition, the evaluator can apply the case survey method to increase the generalizability of findings and can combine case studies with other methods. 