Manipulating the design space to resolve trade-offs: Theory and evidence

Trade-offs between design goals have traditionally been studied using optimization approaches, which assume a fixed formulation and framing of the design problem. We propose a novel set-theory framework of design spaces to model the role of problem reformulation and reframing in resolving design trade-offs. The framework predicts mechanisms by which the designer can alter the boundaries and structure of that space to alter or avoid Pareto frontiers in the original space. Empirical evidence from interviews with designers identifies eight distinct trade-off response mechanisms aligned with the framework's predictions. The framework and interview results provide a foundation for developing methodologies that encourage design space restructuring to avoid unnecessary design compromises and sacrifices.