This document discusses primary and secondary data collection methods for business research. Primary data is collected directly by the researcher, while secondary data is collected by others. Some key advantages of primary data are that it is directly relevant to the research and the researcher controls quality, while secondary data advantages are lower cost and quicker collection. The document then discusses various secondary data sources and methods for collecting primary data, including observation, interviews, questionnaires, and case studies. It also covers issues like non-response and how to minimize it in primary data collection.