on-line survey  
  in-depth interview  
  FGI  
  Secondary research  
  Mailing survey  
  Telephone interview  
  Street accessing  
Case investigation means that the survey aims to the information which has existed and has been collected in some purpose, collecting and selecting the second hand information to judge the questions and problems which have been partially and entirely solved. Case investigation relates to the affirmatory area investigation which is the first step of marketing research, collecting the marketing data which has existed for researching into the next step.
 
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