This paper builds upon the previous research of Beynon-Davies and Williams (2003) and their knowledge-based model of the diffusion of Information Systems Development Methods (ISDMs). Through the lens of the implementation of a UK government IS development project we consider how a Rapid Application Development approach was unbundled and contextualized and highlight the problems experienced. We further reflect how evidence from this empirical case confirms the efficacy of many of the elements of the diffusion model and suggest a number of directions for extending this framework, enabling better understanding of the practical application of ISDMs within organizations.