Abstract
This article was orginally published as thePhi Delta Kappa Meritorious Award Monograph—No. 3in honor of Dr. Roald F. Campbell, the recipient ofthe 1979 Phi Delta Kappa Award for Meritorious Contributions to Education through Research, Evaluation, and Development. The article was made avaitable for publication in theEAQ through the cooperation of Dr. Campbell and Phi Delta Kappa.

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