Learning in design is a phenomenon observed in design practice. Yet there is no comprehensive model or theory that explains the phenomenon and hence serves as a basis upon which a shared understanding can be evolved. This paper describes the development and evolution of a novel model of learning in design, LinD, which seeks to address the need for such a model. The model features formalisms for describing the cognitive activities of design and learning and three links that explain the interactions between these activities: the epistemic, teleological and temporal