When any of the interventions or treatments that were intended for one group of participants in a research study is also delivered to members of the control group as well, who were not supposed to receive any intervention.
Glossary
Contamination
Glossary
Classification (s)
Research term
Foundational paper (s)
Rhoads, C. H. (2011). The Implications of “Contamination” for Experimental Design in Education. Journal of Educational and Behavioral Statistics, 36(1), 76–104. https://doi.org/10.3102/1076998610379133