Cost-Justifying Usability, 2nd Edition

may be intended for many more (or fewer) than 250 users, and the fully loaded

hourly wage (the costs of salary plus benefits, office space, equipment, utilities,

and other facilities) of your personnel may be significantly lower or higher than

those assumed in these sample analyses.

Note that, in general, certain parameters in a cost-benefit analysis have a

major impact on the magnitude of potential benefits. For example, when

considering user productivity—of primary interest to internal development

organizations—the critical parameters are the number of users, the volume of trans-

actions, and, to some extent also the users’ fully loaded hourly wage ...