Let's compare prototypes for tangible systems: but how and why?

Abstract

We introduce a model (called Filter-Fidelity-Profiles), which allows us to describe, classify and systematically compare prototypes for tangible systems. Our Filter-Fidelity-Profiles (FFP) are based on two axes. One axis (the filter) reflects the quality of elements represented by the prototype. It provides a product centric, structured view on the design space of the final system. The second axis defines the fidelity (closeness) of these elements in relationship to those of the final system. Based on our literature survey, as well as our experience in industrial projects, the creation of prototypes is often more focused on capturing the design intent of their creators and lacks a more comprehensive view, considering the evaluation of these intents. Therefore it might miss opportunities in terms of efficiency and effectiveness during the design process. The reason being, that prototypes might have the wrong focus, and therefore might even cause errors during evaluation. In order to focus more on the relevant aspects of a prototype, our model works towards a definition of fundamental building blocks, and provides a language to describe them. This is a necessary first step to make prototypes comparable. Dedicated comparisons, allow us to investigate the variations between different prototypes in subsequent steps within the same project as well as between different processes and reveal its appropriateness for answering particular design questions. The FFP therefore aims to improve the usage of prototypes in general.