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Egon Guba, characteristically in partnership with his wife Yvonna Lincoln, significantly redirected the course of educational & social program evaluation in the latter part of the 20th century. Egon's contributions to the theory & practice of evaluation were anchored in his adoption & promotion of a constructivist philosophy for evaluation but also went well beyond constructivism to engage consequential issues of interests, politics, & values. This brief tribute to Egon features selected highlights from his profoundly influential evaluative thinking. References. [Reprinted by permission of Sage Publications Inc., copyright 2008.]