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Ranges

A variation on calculating average completion time by task is to create ranges, or discrete time intervals, and report the frequency of users who fall into each time interval. This is a useful way to visualize the spread of completion times by all users. In addition, this might be a helpful approach to look for any patterns in the type of users who fall within certain segments. For example, you may want to focus on those users who had particularly long completion times to see if they share any common characteristics.

From

Cover of Measuring the User Experience, 2nd Edition

Note

DAWSON REPORT - can calculate range in comparison to optimal time on task