For example, the usability experts in usability inspections studied by Barcelos et al. [53] and Følstad [25] identified a number of usability issues not identified by the users; issues that also had different qualitative characteristics.
Table 11 Pairwise comparison values for the NFRs of the meeting scheduler example Usability Performance Security Usability 1 1/7 1/5 Performance 7 1 3 Security 5 1/3 1 Sum 13 1348 4.2.
Table 8 Normalized pairwise comparison matrix for the variants contributions to the Security NFR Security var3 var4 var5 Weight var3 0.2830.05 0.10 0.074 var5 0.6430.24 0.23 0.283 var5 0.54 0.71 0.68 0.643 Table 9 Variant's contributions to the usability NFR of meeting scheduler example Usability var3 var4 var5 var3 1 1/3 1/5 var4 3 1 1/3 var5 5 3 1 Sum 9 4.33 1.53.
For example, to ensure usability of the network, the node number of the output layer must be less than that of the input layer.
One reason why findings from users' design feedback were found to have relatively high levels of impact may be that such findings, as opposed to, for example, the findings of usability experts in usability inspections, allow the development team to access the scarce resource of users' domain knowledge.
The literature describes mostly single projects to analyse usability, for example just for one distinct/single information system or module [ 13- 20].
However, GPs expressed a number of reservations about various system functionalities – for example: in relation to usability, system navigation and information visualisation.
For example, in their study of usability testing with disabled users, Petrie et al. [48] compared the self-reported usability problems from users that self-administer the usability test at home to those that participate in a similar usability test in the usability laboratory.
Boden's usability study, for example, had a sample of just 30 people across three countries.
The design of computational artifacts involves many communication acts occurring through different channels; usability tests, for example, have been used as a main communication channel between designers and users.
