As an emerging field, pervasive computing has not had the opportunity to develop a conceptual model similar to the OSI Reference Model used to describe computer networks. Such a model would be useful in properly classifying design issues and providing needed context. Inspired by the layers of abstraction provided by the OSI Reference Model, we present our Layered Pervasive Computing (LPC) model to facilitate discussion and analysis of pervasive computing systems by providing a much needed conceptual framework. A key feature of our model is its representation of the human user at each layer of abstraction of the model. We will then use our model to analyze a research prototype created as part of our Aroma pervasive computing project. This analysis is illustrative because it quickly reveals issues that must be addressed to realize our research prototype as a commercial product.