In this topic you will learn about sampling. About populations and sampling Frames. A Researcher draws a sample from a larger pool of cases or elements. A sampling element is the unit of analysis or case in a population. It can be a person, a group, an organization, a written document or symbolic message, or even a social action (an arrest, a divorce) that is being measured. The large pool is the population, which has an important role in sampling. To define the population, a researcher specifies the unit being sampled, the geographical location, and the temporal boundaries of populations.