Usability evaluation as part of iterative design of an in-vehicle information system

The potential of in-vehicle information systems (IVISs) to cause driver distraction highlights the need to ensure that such systems are designed in such a way that driver safety is not compromised. The human-centred design approach has much to offer in this regard. Central to this approach is that interface design is an iterative process, and that information on usability is collected as part of this process thus helping to inform system design. This study presents a case study, where the usability of three IVIS display presentation concepts for a music selection device was examined in each of the two phases of design iteration. In Phase 1, data on usability were collected through a cognitive walkthrough approach involving four human factors experts. In Phase 2, data were collected as part of an experimental lab-based study involving 30 potential users. The approach was effective in highlighting areas for design improvement and was sufficiently sensitive in differentiating the concepts on the basis of their usability. Suggestions for a further phase of usability evaluation as part of a subsequent IVIS design iteration are offered.