The External Validity of Experiments
American Educational Research JournalPublished 1 November 1968
Glenn H. Bracht, Gene V. Glass
Citations578
SJR quartileQ1
SJR score2.59
SNIP3.57
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Abstract
Shortly after publication, Donald T. Campbell and Julian C. Stanley's Experimental and Quasi-Experimental Designs for Research on Teaching (1963) gained the status of a classic exposition of experimentation in education. There have been few attempts to extend this pioneering work, as might be expected of a work so comprehensive in conception and so brilliant in execution. Webb et al. (1966) produced a work similar in purposethat being to identify sources of external invalidity which arise from the reactive effect of measurement. We know of no other
Keywords
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