Calculate the improvement in measured usability.
- Average time to complete each task/sub-task, completion, and error rates.
For each sub-task and for the overall tasks done together, multiply the time saved by the number of users that execute that task/day.
If users execute a task several times/day, multiply by that number.
Convert time units to hours and then multiply time saved (in hours) by users’ salary (per hour).
Determine the savings for one year by multiplying the previous figure by days/year that users execute the task.
This equals the total annual savings from the usability improvement due to time saved by the software improvements that allowed users to complete task(s) more quickly.
For step 2, you can also make a single change and isolate the effect of that one particular change on the user’s performance. Or if you are just interested in getting the biggest bang for the buck as fast as you can, make as many improvements as possible within your time objectives.
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