= Donald B. Campbell
{wiki=Donald_B._Campbell}
Donald B. Campbell (1920–1996) was an influential American psychologist known for his contributions to the field of social science research methods and psychology. He is best known for his work on the philosophy of science, particularly in relation to the concepts of validity, and he played a crucial role in developing the field of program evaluation. Campbell co-authored the Campbell and Stanley framework for quasi-experimental research designs, which addressed issues of internal and external validity in research.
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