What allows theories to evolve, to progress? A contentious notion, progress still haunts a number of contemporary theories. However, little research invites us to rethink progress in a comprehensive way. In this article, I contribute to this issue by considering the paradigmatic case of David Harvey’s Marxism. A pathbreaking thinker in geography, sociology, and urban studies, Harvey claims his theory intrinsically surpasses its inherent contradictions. However, numerous authors suggest otherwise, as it fails to engage with essential urban processes such as (...) those based on state, gendered, racial, or environmental dynamics. These aspects of social life challenge his dialectical ambition. I argue that Harvey’s attachment to an orthodox Marxism ultimately limits his claim to theoretical progress. Reviewing Harvey’s overall body of work, I focus on his metatheory regarding space and his examination of the Paris Commune. I argue that his ideas on the progress of theory follow from his dialectical assumptions, which in turn inhibit his portrayal of practical realities and a continuous dialogue with concrete cases. (shrink)