Cost-Justifying Usability, 2nd Edition

These percent differences between models were compared to the goal percent

differences for each task, also presented in the spreadsheet (row 14). The

modeled percent differences are presented as red (and positive) numbers when

the proposed application was predicted to be slower (that is, take more time)

than the existing applications, green (and negative) when the proposed appli-

cation was predicted to be faster (that is, take less time) than the existing appli-

cations, and orange (and positive) when the proposed application was predicted

to be slower than the existing applications but not by much.

An inspection of these numbers in the spreadsheet ...