The PSSUQ (Post-Study System Usability Questionnaire is a 16-item standardized questionnaire. It is widely used to measure users’ perceived satisfaction of a website, software, system or product at the end of a study. PSSUQ originated from an internal IBM project called SUMS (System Usability Metrics) in 1988. A few rounds of improvements has resulted in PSSUQ Version 3, which is the one used today.
You may find different versions of PSSUQ available online and the way to differentiate them is to look at the number of questions. There are 18 questions in Version 1; 19 questions in Version 2; and 16 questions in Version 3.
Another alternative to PSSUQ is the System Usability Scale (SUS).
PSSUQ (Post-Study System Usability Questionnaire)
PSSUQ Version 3 consists of 16 questions with 7 options (+ NA option) to choose from. The sample below shows a PSSUQ questionnaire to measure the usability of a website.
On a scale between Strongly Agree to Strongly Disagree, please rate the following statements regarding Amazon:
- Overall, I am satisfied with how easy it is to use this system.
- It was simple to use this system.
- I was able to complete the tasks and scenarios quickly using this system.
- I felt comfortable using this system.
- It was easy to learn to use this system.
- I believe I could become productive quickly using this system.
- The system gave error messages that clearly told me how to fix problems.
- Whenever I made a mistake using the system, I could recover easily and quickly.
- The information (such as online help, on-screen messages, and other documentation) provided with this system was clear.
- It was easy to find the information I needed.
- The information was effective in helping me complete the tasks and scenarios.
- The organization of information on the system screens was clear.
- The interface of this system was pleasant.
- I liked using the interface of this system.
- This system has all the functions and capabilities I expect it to have.
- Overall, I am satisfied with this system.
Measuring PSSUQ (Post-Study System Usability Questionnaire)
PSSUQ follows a 7-point Likert Scale (+ NA option). The overall result is calculated by averaging the scores from the 7 points of the scale. Unlike SUS, as there are more questions in PSSUQ, it also has 3 sub-scales, namely system usefulness, information quality, and interface quality.
- Overall: the average scores of questions 1 to 16
- System Usefulness (SYSUSE): the average scores of questions 1 to 6
- Information Quality (INFOQUAL): the average scores of questions 7 to 12
- Interface Quality (INTERQUAL): the average scores of questions 13 to 16
The sub-scales provide a more detailed breakdown of different factors affecting the website, software, system or product.