Abstract: A method for assessing effects of an undergraduate environmental history course on student environmental worldviews is described; its foundation is triangulation of method. A grounded survey instrument developed specifically for the study was used to supply quantitative and qualitative data, which were supplemented by data from open-ended interviews. The method, which can be adapted for use in other courses, was effective in identifying the degree and direction of changes, both subtle and dramatic, in student worldviews. Assessment of affective outcomes of environment-related courses is necessary, and the combination of methods described here for such assessment is more effective than any one of the methods alone.