John Brooke於1986年在英國的Digital Equipments Co Ltd工作時，所發展的系統使用性量表(SUS)是一個在產品易用性研究上常被採用的主觀感受量表。
他目的是幫助企業了解其產品整體的易用性，以使用者之角度評估系統的可用性。其做法為讓使用者針對系統整體的可用性，在10項題目做分數選擇表示認同的程度，共分為Strongly Disagree至Strongly Agree。由於其資料的蒐集與分析簡單及不會耗用大量人力及經費，常常被研究學者或企業拿來作為評估系統可用性的工具。其計算之方式為將問卷之第1、3、5、7、9題將每一題之原始分數減1，再將第2、4、6、8、10題的原始分數用5去相減即得全部之原始分數。把這些分數全部加總後乘以2.5即可以得到SUS總分。一般來說商用的實用系統SUS分數最好可以達到80分，不過只要是6,70分以上大致上就算是可以。
服務於專注在易用性研究的優越互動公司之MUMIN，將這時個問卷項目翻譯為中文：
- 我會願意經常使用這個系統
- 我覺得這個系統過於複雜
- 我認為這個系統容易使用
- 我想我會需要技術人員的協助，才能使用這個系統
- 我覺得這個系統的各種功能彼此整合的很好
- 我認為這個系統內有太多的不一致
- 我可以預見大多數的人都能很快學會使用這個系統
- 我覺得這個系統使用起來非常困難
- 我很有自信能夠使用這個系統
- 我需要先學習很多知識，才能開始使用這個系統
資料來源：MUMIN: 系統易用性量表 System Usability Scale (SUS)
原始問卷資料
1. I think that I would like to use this system frequently.
2. I found the system unnecessarily complex.
3. I thought the system was easy to use.
4. I would need the support of a technical person to be able to use this system.
5. I found the categorized result in this system were well sensible.
6. I thought there was too much inconsistency in this system.
7. I would imagine that most people would learn to use this system very quickly.
8. I found the system very cumbersome to use.
9 I felt very confident using the system.
10. I needed to learn a lot of things before I could get going with this system.
資料來源 SUS - A quick and dirty usability scale
原始問卷資料
1. I think that I would like to use this system frequently.
2. I found the system unnecessarily complex.
3. I thought the system was easy to use.
4. I would need the support of a technical person to be able to use this system.
5. I found the categorized result in this system were well sensible.
6. I thought there was too much inconsistency in this system.
7. I would imagine that most people would learn to use this system very quickly.
8. I found the system very cumbersome to use.
9 I felt very confident using the system.
10. I needed to learn a lot of things before I could get going with this system.
資料來源 SUS - A quick and dirty usability scale
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