Abstract
The problems of using pre- and post-test designs have been recognised by researchers from different disciplines for many years. The need for a concurrent control group has been recognised for at least 150 to 200 years (Chalmers, 2001).
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© 2008 David J. Torgerson and Carole J. Torgerson
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Torgerson, D.J., Torgerson, C.J. (2008). History of Controlled Trials. In: Designing Randomised Trials in Health, Education and the Social Sciences. Palgrave Macmillan, London. https://doi.org/10.1057/9780230583993_3
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DOI: https://doi.org/10.1057/9780230583993_3
Publisher Name: Palgrave Macmillan, London
Print ISBN: 978-0-230-53736-1
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