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« Previous Home Next » Research design provides the glue that holds the research project together. A design is used to structure the research, to show how all of the major parts of the research project -- the samples or groups, measures, treatments or programs, and methods of assignment -- work together to try to address the central research questions. Here, after a brief introduction to research design , I'll show you how we classify the major types of designs . You'll see that a major distinction is between the experimental designs that use random assignment to groups or programs and the quasi-experimental designs that don't use random assignment.