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Control group with red circle with a line through it to cross it out. Intervention group and Researcher looking at both.

A preexperimental design is defined by the absence of a control group and by the absence of random assignment. Only the program participants are tracked in these types of studies.

There are several variations within the category of preexperimental design, differing only in the number and the timing of outcome measurement points. These variations include:

  • Posttest only,
  • Pre- and posttest, and
  • Pre- and posttest with follow-up.

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