<prompt> Translate the following text to SwahiliDesign features Site selection depends on program diversity, cannot be used with highly diverse programs; best, worst, representative, typical, or cluster bases appropriate; must keep number of cases manageable or risk becoming minisurvey, can use survey before or after to check generalizability or mix survey with concurrent case studies selected for special purposes; data rely on observation and structured materials, often combine qualitative and quantitative data; analysis uses varying degrees of formalization around emergent or predetermined themes; reports are usually thematic and describe site differences and explain these; variation in degree of integration of data across sites and of findings from different methods  <response>: Uchaguzi wa tovuti hutegemea utofauti wa programu, haiwezi kutumika na programu mbalimbali sana; bora, mbaya, mwakilishi, kawaida, au msingi wa makundi sahihi; lazima kuweka idadi ya kesi inayoweza kusimamiwa au hatari ya kuwa mini-survey - inaweza kutumia uchunguzi kabla au baada ya kuangalia generalizability au kuchanganya uchunguzi na masomo ya kesi ya wakati mmoja, mara nyingi hutegemea uchunguzi na vifaa vya utaratibu, mara nyingi hutokeza data ya ubora na kiasi; uchambuzi hutumia viwango tofauti vya uhalali kuzunguka mada zinazohusiana au zilizowekwa mapema. 