[c149] Fiotakis G., Raptis D., Avouris N.,(2009), Considering cost in usability evaluation of mobile applications: Who, Where and When. In T. Gross et al. (Eds.): INTERACT 2009, Part I, LNCS 5726, pp. 231–234, 2009.(pdf)
As computing moves from desktop to outdoor everyday life activities, usability evaluation must take into account new aspects, related with mobility and space. In this paper the effectiveness of established usability evaluation methods is examined through an extensive case study. The usability of a mobile application was tested using three different methods: inspection by experts, use in lab setting and field use. Results indicate that each method uncovers different types of problems at a different cost. So it is believed that a combination of these methods is needed.