<prompt> Translate the following text to SwahiliSince case study designs center on one or a few cases and lack the controls usually thought necessary to an understanding of causal relationships, knowledge that  <response>: Kwa kuwa muundo wa utafiti wa kesi unazingatia kesi moja au chache na hauna udhibiti unaodhaniwa kuwa muhimu kwa uelewa wa uhusiano wa sababu, maarifa ambayo 