Chapter 13 Using Non-functional Requirements as Design Drivers for Universal Access

Abstract

This Chapter elaborates on a technique aiming to provide early insight into the identification of universal access software quality attributes. The technique, referred to as Non-Functional Requirements Analysis (NfRA), constitutes a preliminary step in a scenario-based inquiry motivated by an explicit focus on non-functional requirements (NfRs) as drivers for scenario retooling (Erskine et al., 1997). This Chapter will illustrate the method by focusing on four main NfRs that are critical for universal access, namely adaptability, scalability, platform independence and user tolerance or individualisation. These are general NfRs applicable to a broad range of interactive software, irrespective of their functional scope, interaction platform or intended use.