The document discusses different types of research producers use when making a film, including primary, secondary, qualitative, and quantitative research. Primary research involves collecting original data through surveys and interviews, while secondary research uses existing data sources. The document provides examples of both primary and secondary research techniques used in pre-production and post-production, such as surveys of target audiences and analyzing box office data from previous similar films. Producers use this market research to inform decisions around film content and marketing campaigns aimed at appealing to audiences.