Cost-Justifying Usability, 2nd Edition

column H), 54 keystrokes (row 55, column I), and so on. Row 57 calculates the

total time spent during the whole task on each operator type. This is calculated

by multiplying the count in row 55 by the time value of the parameter the column

represents. For example, there are 8 mouse clicks (row 55, column H), and each

mouse click is assigned a time value of 0.12 seconds (see Table 16.1), so the total

time spent on mouse clicks during the whole task is 0.96 seconds (row 57, column

H). The total task time is calculated by adding up all the time values across

operator types in row 57. This value is calculated and displayed in column H of

row 59.

In the ...