Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:3 Perceived reachability Perceived reachability (PR) is a relatively new concept in IS/IT research, but has been used with research dealing with wireless technology, for example by Kim and Garrison (2009), who were among the first to incorporate PR into the TAM framework. PR refers to “an individual’s perception regarding the degree to which he or she can “reach” other individuals “anytime-and-anywhere” via mobile wireless technology” (Kim and Garrison, 2009, p. 326). Thus, PR refers to the capability to connect with others. Sales jobs can necessitate spending a considerable amount of work time away from the employer’s base, and it can be argued that mobile technology provides an ideal enhancement for salespeople. Indeed real time responses to customers improve the working processes of salespeople (Sheng et al., 2005). Moreover, Rivers and Dart (1999) suggested that timely information could improve the quality of any sales effort.
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