text: The greatest difference , to some experts , between other methods and case studies is the distinction between the researcher 's ( 1 ) beginning by presuming , a priori , to know the relevant constructs and variables , measuring their incidence , and finding out how changes in them may be influenced by other events and ( 2 ) entering into an event to learn what is significant in it to the participants .
  
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  Some experts think researchers begin with a totally open mind with a case study .