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We begin with a discussion of contemporary approaches to assessment highlighting their reliance on a static, linear model of knowledgeable performance. Next we describe an ecological psychology approach to problem solving. Then, we propose the adoption of an agent-environment interaction as the unit of analysis. We continue by describing the problem-solving process from an ecological psychology perspective, to clarify the “intentional unit”. We close with a discussion of functional validity, the value added by access to assessment information during the problem-solving process.