Architectural models are used at various stages of a project. As working models they support the design process: they are made up from time to time using simple materials, such as cardboard, without any attempt at accuracy, and continue to be adjusted and added to as the ideas and the design progress. The point here is to swiftly check a design idea, to allow it to be continued or dismissed. Presentational models are more involved; at this stage the design has been completed and the purpose of the model is to convey the ideas to the potential user in a clear and easy-to-understand way.
The book Architecture and Model Building includes outstanding examples explaining the possibilities of this medium and, at the same time, provides comprehensive information on materials and techniques.