This document defines various types of research and terminology used in research. It discusses primary and secondary research, quantitative and qualitative research, and different types of audience, market, and production research. Key terms like circulation, hits, box office figures, ratings, and sales are defined as metrics used to measure the success of various media. Advantages and disadvantages of each research type are provided along with examples. Terminology related to objective, subjective, valid, and reliable research is also defined.