This document discusses various research methods and sources of secondary data. It describes internal and external sources of secondary data for companies. Some prominent external sources mentioned include CMIE, The Hindu newspaper, and syndicated research studies. It also discusses creating mechanisms for gathering secondary data over time from business publications and newspapers. The advantages and disadvantages of secondary data are outlined. Finally, the document discusses exploratory and conclusive research, and provides details on qualitative research techniques like depth interviews, focus groups, and projective techniques.