<prompt> Translate the following text to SwahiliA retrospective cumulative case study was conducted by the World Bank in its examination of four in-depth case studies of the effectiveness of educational programs.  <response>: Uchunguzi wa kesi ya jumla ya nyuma ulifanywa na Benki ya Dunia katika uchunguzi wake wa masomo manne ya kesi ya kina ya ufanisi wa programu za elimu. 