System Usability Scale In UX Research

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The System Usability Scale (SUS), a creation of John Brooke in ’86, is an excellent way to measure how easy your product or design is for users. It’s not limited to one type either – SUS can be applied across many different digital solutions! Designed with the ISO 9241-11 standards as its foundation and without requiring extensive diagnostic testing as usability reports do, SUS offers UX practitioners efficient insight into potential problem areas within user experience designs.

Invite your users to give critical feedback on their experience in usability testing sessions with the reliable and repeatable SUS questionnaire. Using a descriptive header for each session, quickly compare design solutions via A/B testing while keeping all questions consistent between tests – this ensures that results are straightforward, concise, and unbiased. Your user’s insights will help deliver better experiences!


What is the System Usability Scale (S U S)?

Have you ever struggled to use a digital product or service? Usability is key to creating successful designs, and the SUS (System Usability Scale) questionnaire can help measure how user-friendly your strategy is. It’s an efficient 10-item Likert scale that allows UX designers to quickly spot any issues with their products – providing reliable feedback without taking too much time!

John Brooke created the System Usability Scale in 1986, a method used to evaluate electronic office systems. In modern times, it is applied across numerous web-based and technology-related applications to improve usability through evaluation. This has helped facilitate smoother user experiences for those engaging daily with these tools.

UX professionals use user-focused designs to craft a streamlined and enjoyable experience for the end user. To ensure this, they employ techniques such as user testing throughout product development – one of which is SUS, helping to pinpoint areas where usability improvements can be made so that users are delighted with their final product.

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How do you measure usability?

The System Usability Scale offers a comprehensive approach to evaluate the overall user experience, comprising four key areas:

  • Efficiency (how quickly it can be used).
  • Intuitiveness (how easily understood by users).
  • Ease of use.
  • Satisfaction (the subjective preference for usage).


How do you score the System Usability Scale?

It’s easy to get an accurate measure of user satisfaction with the System Usability Scale. Participants rate how much they agree or disagree with ten questions from 1-5, and odd-numbered scores are lowered by one while evens drop down to four for maximum positivity. All values then total up and multiply by 2.5 – giving you a score between 0 and 100!


How to calculate a SUS score?

Analyzing survey results yields an overall SUS score, calculated by integrating responses across a range of odd- and even-numbered questions. By adding together the total scores for each set and subtracting specific values from those totals, we can arrive at our final numerical outcome – multiplied by 2.5 to give us insight into how well users interpreted the questionnaire’s material!

With the detailed scoring tabulation, you can obtain a SUS score to know exactly how your design solution fares in terms of usability. A higher-than-average score will indicate that users have enjoyed an above-average user experience; conversely, getting below the overall 68 mark could show areas for improvement.

User Satisfaction Scores can be classified into six different categories, ranging from “best imaginable” to the most concerning “worst imaginable.” How a UX designer responds depends on this evaluation- whether they investigate further by exploring users’ experiences and existing pain points or take an alternate approach entirely is up for them to decide.


What to do in the case of deficient SUS scores

Poor usability scores could indicate fundamental flaws in a design’s structure, clarity, and flow. To uncover the source behind low-performance numbers, UX practitioners can investigate areas such as navigation hierarchy, clear labeling, and sensible content categories to ensure users quickly complete their tasks without encountering any frustration or errors.


What is a good SUS score?

With over 500 studies gauging user experience, the average Systems Usability Scale (SUS) is 68 – your score can tell you how it stacks up against others. If your rates are higher than this benchmark, consider yourself above average; anything lower, and you may want to optimize for better UX performance! Normalizing lets users know their SUS percentile rank compared to other scores seen among many studied cases – much like “grading on a curve” – so be sure to crunch those numbers when possible.

The SUS score is a great way to measure user satisfaction, providing stakeholders with an easy-to-understand representation of the results. To make it easier to interpret these scores quickly and accurately, they are converted into percentiles – enabling them to determine if the result is higher or lower than average at a glance.


What SUS scores provide?

Assessing the usability of design solutions just got easier! Using System Usability Scale scoring, you can quickly and accurately ensure your prototype or sprint deliverable provides an easy user experience. With this method, evaluations become more efficient while gaining valuable insight into overall ease of use – without pinpointing each problem.


The Advantages of the System Usability Scale



SUS is a reliable questionnaire, even with tiny sample sizes of two users. However, due to its small sampling size, the results can only be generalized to these users. They should therefore include confidence intervals to encompass potential variability within an unknown user population’s SUS score.



SUS has provided a powerful tool for assessing usability, proving adept at distinguishing between usable and unusable systems. Its accuracy is remarkable compared to other questionnaire-based methods of measuring user experience.



For those of us needing more money and time, a 10-item questionnaire offers the perfect solution! It is cost-effective and easy to manage, delivering results with minimal resource strain.



With many SUS templates to choose from, the heavy lifting has already been done – it’s up to you to reap the benefits!


Where does the System Usability Scale (SUS) come from?

John Brooke revolutionized the way we think about usability with his questionnaire, The System Usability Scale. By recognizing that measuring product success depends on the context and cannot be perfectly calculated in a lab setting, he set an invaluable standard for evaluating design over 30 years ago, which is still applied today!

With the growing importance of user-friendliness and market, competition arises a need for an efficient tool to measure one’s system usability and compare it with others. The System Usability Scale (SUS) provides a questionnaire consisting of ten questions tailored to assess product quality within its contextual boundaries.

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This article has revealed how the System Usability Scale (SUS) can be used to understand a user’s experience with any website, application, or solution. Its quick and reliable nature makes it easy for designers to measure overall ease of use without needing detailed insights into their design’s specific issues.

As UX professionals, striving for a good SUS score should not be our only goal. Instead, we must always strive to build well-designed and user-friendly products – this means constantly researching how users will interact with the product in different contexts and adapting accordingly by making necessary improvements or adjustments as needed.

Ui UX design services

Our Ui ux design services help you improve your user’s experience and let them enjoy checking out your website or application. We help make your interfaces more user-friendly and efficient. ui/ux design services can also help you gather valuable feedback from customers to improve your product or service.


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