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

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Usability Testing (19)

Sample Size (18)

UX (12)

Task Time (11)

Survey (11)

Usability (11)

SUS (11)

Questionnaires (9)

Usability Problems (9)

Rating Scale (8)

Net Promoter Score (7)

Statistics (7)

Remote Usability Testing (7)

Usability Metrics (6)

Problem Discovery (6)

Satisfaction (6)

Confidence Intervals (5)

Task Completion (5)

Formative Testing (3)

Regression Analysis (3)

User Research (3)

Summative (3)

Loyalty (3)

Heuristic Evaluation (3)

SUPR-Q (3)

Margin of Error (2)

Credibility (2)

Card Sorting (2)

Qualitative (2)

Information Architecture (2)

Sampling (2)

Crowdsourcing (2)

Clicks (2)

PhD (2)

Benchmarking (2)

Mobile Usability Testing (2)

SEQ (2)

Keystroke Level Modeling (2)

Problem Severity (2)

Cognitive Walkthrough (2)

Task Times (1)

Task Failure (1)

Salaries (1)

Ordinal (1)

Completion Rate (1)

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UI Disasters (1)

Interval (1)

Marketing (1)

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Monte Carlo (1)

Return on Investment (1)

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Geometric Mean (1)

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Methods (1)

Evidence Based Design (1)

A/B Testing (1)

iPhone (1)

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Lean UX (1)

Correlation (1)

Errors (1)

Reliability (1)

Think Aloud (1)

Post-Task Ratings (1)

Quality Assurance (1)

Usability Problems Topics


Measuring Errors in the User Experience

Measuring Errors in the User Experience

Jeff Sauro • May 15, 2012

Errors can be categorized as slips (like a typo) or a mistake (incorrect goal) and are common occurrences in usability tests. Errors are often caused by problems in an interface and lead to longer task times, higher task failure and lower satisfaction ratings. While errors can't be entirely eliminated, they can often be reduced substantially be reducing the opportunity for an error.[Read More]


10 Things to Know about Usability Problems

10 Things to Know about Usability Problems

Jeff Sauro • July 26, 2011

If you collect nothing else in a usability test it should be a list of problems encountered by users. It seems so simple yet there is a rich history of how many users you need to test, what constitutes a problem and which method to use.[Read More]


Is that a Usability Problem or a Feature?

Is that a Usability Problem or a Feature?

Jeff Sauro • July 19, 2011

A usability problem to one usability expert is a feature to another. There is a balance between business interests and user interests but the two aren't mutually exclusive. The discussion should be about short-term revenue at the expense of long term profits--not usability versus revenue.[Read More]


14 burdens placed on the user

14 burdens placed on the user

Jeff Sauro • July 5, 2011

I've listed 14 of the more frequent/painful burdens I experience in the hope we can shift the burden more from the human back to the computer: passwords, account numbers and confirmation dialogues get special attention.[Read More]


Four Terrific and Four Terrible User Experiences

Four Terrific and Four Terrible User Experiences

Jeff Sauro • May 24, 2011

When we look to improve the user experience of software or websites, sometimes the best improvements aren't slight tweaks to the interface but involve eliminating steps altogether. Here are four examples of terrific and terrible experiences from the physical world to inspire the digital one.[Read More]


How many customers should you observe?

How many customers should you observe?

Jeff Sauro • February 8, 2011

Observing customer behavior is an excellent way for discovering opportunities for product innovation. The number of customers you need to observe can be determined using the binomial probability formula and will vary depending on how common customer behaviors are and how certain you need to be.[Read More]


Can users self-report usability problems?

Can users self-report usability problems?

Jeff Sauro • October 6, 2010

When users document the usability problems they encounter during a usability test, they find around half as many problems as trained professionals watching users in a lab. This low-cost method is a good supplement to heuristic evaluations and user testing.[Read More]


How should you display links to PDF files?

How should you display links to PDF files?

Jeff Sauro • March 18, 2010

One consequence of analyzing user data is having to reconcile conflicting data-points. How would you display links to PDF files on a web-page?[Read More]


If 1 of 5 users has a problem in a usability test will it impact 1% or 20% of all users?

If 1 of 5 users has a problem in a usability test will it impact 1% or 20% of all users?

Jeff Sauro • February 1, 2010

Insurance companies do it, drug companies do it and so should usability testers. When you observe a problem from a small sample test, it is unlikely the problem only affects a tiny percentage of users.[Read More]

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About Jeff Sauro

Jeff Sauro is the founding principal of Measuring Usability LLC, a company providing statistics and usability consulting to Fortune 1000 companies.
He is the author of over 15 journal articles and 3 books on statistics and the user-experience.
More about Jeff...

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Jeff's Books

Quantifying the User Experience: Practical Statistics for User ResearchQuantifying the User Experience: Practical Statistics for User Research

The most comprehensive statistical resource for UX Professions (JUST RELEASED)

Buy on Amazon

Excel & R Companion to Quantifying the User ExperienceExcel & R Companion to Quantifying the User Experience

Detailed Steps to Solve over 100 Examples and Exercises in the Excel Calculator and R

Buy on Amazon | Download

A Practical Guide to the System Usability ScaleA Practical Guide to the System Usability Scale

Background, Benchmarks & Best Practices for the most popular usability questionnaire

Buy on Amazon | Download

A Practical Guide to Measuring UsabilityA Practical Guide to Measuring Usability

72 Answers to the Most Common Questions about Quantifying the Usability of Websites and Software

Buy on Amazon | Download

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