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Task Completion Topics

The high cost of task failure on websites

Jeff Sauro • February 7, 2012

An analysis of 4000 users across 59 websites found that when users fail to accomplish their goals, they are 5 times less likely to return to the website and 3 times more likely to tell their friends not to visit the website.[Read More]

What is a good task-completion rate?

Jeff Sauro • March 21, 2011

Context matters in deciding what a good completion rate is for a task, however, knowing what other task completion rates are can be a good starting point given no other data. An analysis of almost 1200 usability tasks shows that the average task-completion rate is a 78%. Anything above a 78% is above average and can be a good starting point for goal setting. I'm not suggesting you use this information blindly when establishing a goal for a task-completion rate.[Read More]

What to do with task times when users fail a task

Jeff Sauro • April 29, 2010

For most cases exclude the users who fail the task and call it the average task completion time. Keep the failed task times to report Mean Time to Failure and Average Time on Task.[Read More]

Do users fail a task and still rate it as easy?

Jeff Sauro • October 9, 2009

Only 14% of users who fail a task rate it at maximum level of satisfaction. In general there is an 80/20 rule of satisfaction and completion rates: 80% of users who rate at the maximum level of satisfaction will pass and 80% of users who rate at the minimum satisfaction level will fail the task.[Read More]

Margins of Error in Usability Tests

Jeff Sauro • August 6, 2009

How many users will complete the task and how long will it take them? If you need to benchmark an interface, then a summative usability test is one way to answer these questions. Summative tests are the gold-standard for usability measurement. But just how precise are the metrics?[Read More]