This document defines key terminology used in research such as circulation, hits, box office figures, and ratings. It also defines and compares different types of research like primary and secondary research as well as quantitative and qualitative research. Finally, it discusses different focuses of research like audience, market, and production research. Key advantages and disadvantages of each research type are provided along with examples. The document concludes with definitions of objective and subjective research and how to evaluate research validity and reliability.