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Three clipboards - one of them labeled 'Preexperimental', one labeled 'Quasi-experimental' and one labeled 'Experimental.'
What Is Evaluation Design?

Evaluation design refers to the structure of a study. There are many ways to design a study, and some are considered to be more rigorous than others. Evaluation designs are differentiated by at least three factors:

  1. The presence or absence of a control group (or groups) in the study,
  2. How participants are assigned to study groups (i.e., with or without randomization), and
  3. The number of times or frequency with which outcomes are measured.

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