While the established, coherence view of internal fit provides a compact representation of firms and strategy, it also discounts the strategic benefits of tensions and contradictions, and downplays strategy creation and change. Here, we develop a novel dialectical alternative to fit-based models of strategy. Within our model, contradictions and tensions serve as a key engine for strategic renewal and transformation.If carefully harnessed through what we call "disciplined incoherence," contradictions can help firms establish and change their strategies and business models, adapt to and shape their environment, and enhance and sustain their competitive advantage. We offer a dynamic, endogenous view of how configurations are generated, transformed, and maintained, and present a processual alternative to current strategy models that are grounded in equilibrium and coherence assumptions. Managerial Summary: Prior thinking suggests that firm strategies should focus on achieving fit between the firm's different elements such as activities, organizational structures, and policies, and that tensions and inconsistencies should be eliminated or minimized. We argue that this view overlooks the important role of contradictions in fostering innovation and competitive advantage and driving strategic change and renewal.Conflicts and contradictions pose their own risks. Yet,