A cohort is a collection of people that form a group. Many communication studies scholars have utilized cohort research designs with great success. A longitudinal research design typically follows a cohort over time and usually compares that group with other groups on some measure to determine if there are any effects caused by the variables under scrutiny. Many cohort studies are prospective, whereby groups are assembled based on some criteria such as age or shared experience, and baseline measurements are taken at the start of the research process. The cohort is then followed over time to chart and discover outcomes of interest. Retrospective studies form cohorts after an effect or event and are also referred to as historical studies. These studies are ...

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