<prompt> Translate the following text to EnglishUtafiti wa kesi za jumla CULTURE ni mchakato wa kukusanya habari inayohitajika ili utafiti uweze kutumika kwa jumla, ikiwa ni pamoja na kupata habari inayokosekana kutoka kwa waandishi juu ya jinsi kesi zilizochunguzwa zilivyotambuliwa na juu ya msingi wa uteuzi wa mfano.  <response>: Backfill Techniques Techniques used in cumulative case studies to collect information needed if the study is to be usable for aggregation; these techniques include, for example, obtaining missing information from the authors on how instances studied were identified and on the bases for instance selection. 