A large body of environmental evaluation research has been constituted by researchers who have come to their work from widely varying backgrounds in design fields and the behavioral and environmental sciences. The diversity in their meta-theoretical and theoretical orientations, methodological skills and preferences, and practical concerns is reflected in the theories, empirical research strategies, and target applications to be found in the extant literature. Certainly, there has been considerable consolidation; some theories have stimulated more research than others, some methodological tools have proven more suitable than others for use by researchers with particular applications and resource limitations in mind, and some means for applying the results have been more widely utilized than others. Yet, as always, some questions should be asked. Do new - or old - data or conceptual arguments imply a need for modifying theory in the area? What additional steps can be taken to foster the coherent cumulation of findings? What (construct/internal/external/ecological) validity issues have not been addressed? Are there more effective ways to apply the results obtained? The proposed session is intended to provide researchers in the environmental evaluation field with an opportunity to reflect on and discuss larger questions such as these, to assess research in the area and discuss steps that might be taken to promote coherence in its further development and application. All of the papers gathered for the session have some bearing on significant theoretical and/or methodological issues in the field. Some of the papers illustrate arguments with results from recent empirical studies.