Health Services Research (HSR) Methods
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Posttest Only Control Group Design
Related Terms: Between Group Design

A type of experimental design in which the experimental and control groups are measured and compared after implementation of an intervention. Comparisons are made only after the intervention, since this design assumes that the two groups are equivalent other than the randomly assigned intervention. Between-group differences are used to determine treatment effects.

Further Reading
Marczyk, G.R. et al. 2005. Essentials of Research Design and Methodology, Hoboken, NJ: John Wiley & Sons.

Gliner, J.A. and G.A. Morgan. 2000. Research Methods in Applied Settings, Mahwah, NJ: Lawrence Erlbaum Associates.

Campbell, D. and J. Stanley. 1963. Experimental and Quasi-Experimental Designs for Research, Boston, MA: Houghton Mifflin Company.