The External Validity of Experiments

1968/11/01 by Glenn H. Bracht, Gene V Glass, Gene V. Glass · 16 citations
Social Sciences · #Evaluation of Teaching Practices #Science Education and Pedagogy #Educational Environments and Student Outcomes

paper · doi:10.3102/00028312005004437

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

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