Measuring Usability
Quantitative Usability, Statistics & Six Sigma by Jeff Sauro

Quantitative Starter Package for Usability Testing

Download both the popular premium report on conducting quantitative usability tests and four helpful calculator packages which allow you to measure and report usability with confidence.
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    $119.99     Now :  

If you will be making copies or distributing the product, please purchase the site license
Purchase this package to get the popular report and calculators (including the average task time & problem frequency) at a discount.

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Features & Benefits

  • 64 Page PDF Premium Report on conducting quantitative usability tests.
  • Problem Frequency Calculator which allow you to estimate a problem's impact on all users in small sample qualitative studies. If you see 2 out of 10 users experiencing a problem this calculator will provide the most likely percentage of users who will experience the problem (between 5% and 52%).
  • Average Task Time Calculator which handles non-normal task time data and provides confidence intervals around the most likely average time.
  • Task Completion Calculator provides the most accurate confidence interval around a small sample completion rate.
  • Questionnaire Confidence Interval Calculator provides a quick way to generate an accurate confidence interval around any size sample for rating scales.

Who Should Buy

Anyone who needs to measure usability and has questions about conducting a usability test, as well as easy ways of generating confidence intervals.


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Report and Calculator Package

Report and Calculator Package

72 of the most common questions and answers for dealing with quantifying the user-experience such as what measures to take, dealing with small sample sizes, confidence intervals, questionnaires and task-times.

Problem Frequency Calculator

Problem Frequency Calculator

Most usability activities are on small sample early designs. During this stage it is helpful to know what percent of users would likely encounter a problem in a design. It is also sold separately as the Problem Frequency Calculator .

Average Task Time Calculator

Average Task Time Calculator

Efficiency is an important component of usability, and task-time is the best way to measure efficiency. This calculator deals with the non-normally distributed nature of task times and gives you the best estimate of the average task time and confidence intervals around this average. It is also sold separately as the average task time calculator.

Completion Rate Confidence Intervals

Completion Rate Confidence Intervals

From early design to benchmark studies, completion rates are a fundamental metric of usability: Can the user complete the task? This calculator provides confidence intervals around the most likely completion rate from any sample size.

Questionnaire Data Confidence Intervals

Questionnaire Data Confidence Intervals

Rating scale questionnaires are a common way of asking users how they perceive the usability of a website and this calculator will provide the confidence intervals around the average rating. It can be used for single questions or aggregate scores such as those from the System Usability Scale.

Statistical Tests

  • Average Task Time Confidence Intervals
  • Completion Rate Confidence Intervals
  • UI Problem Frequency Confidence Intervals
  • Rating Scale Confidence Intervals
  • 1-Sample Binomial Test
  • 1-Sample t-test

What Customers are Saying:

No one knows more about Quantitative Usability testing than Jeff Sauro

Erika Kindlund
UX Manager, Intuit
Your report is excellent - useful and inspiring.

Guy Sangwine
User Experience Specialist
University of Melbourne


    $119.99     Now :  

If you will be making copies or distributing the product, please purchase the site license All major credit cards, debit cards and PayPal Accepted.
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