Scenario-based argumentation for universal access

We present two analytical techniques, namely scenario screening and growth scenarios, for engineering universal access into interactive applications and services. The techniques are intended to bridge across design reflection and envisioning of new practices through use cases. They foster an exploratory approach to design, progressively leading to an understanding of the global execution context of tasks, thus towards universal access. In this paper, we elaborate on the rationale and basic concepts behind scenario screening and growth scenarios, and discuss their application in a small case study in the domain of Health Telematics.