System usability scale

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In systems engineering, the system usability scale (SUS) is a simple, ten-item attitude Likert scale giving a global view of subjective assessments of usability. It was developed by John Brooke at Digital Equipment Corporation in the UK in 1986 as a tool to be used in usability engineering of electronic office systems. The usability of a system, as defined by the ISO standard ISO 9241 Part 11, can be measured only by taking into account the context of use of the system—i.e., who is using the system, what they are using it for, and the environment in which they are using it. Furthermore, measurements of usability have several different aspects: effectiveness (can users successfully achieve their objectives) efficiency (how much effort and resources are expended in achieving those objectives) satisfaction (was the experience satisfactory) Measures of effectiveness and efficiency are also context-specific. Effectiveness in using a system for controlling a continuous industrial process would generally be measured in very different terms to, say, effectiveness in using a text editor. Thus, it can be difficult, if not impossible, to answer the question "is system A more usable than system B", because the measures of effectiveness and efficiency may be very different. However, it can be argued that given a sufficiently high-level definition of subjective assessments of usability, comparisons can be made between systems. The final SUS score can be computed with the following formula: S U S = 2.5 ( 20 + ∑ ( SUS01 , SUS03 , SUS05 , SUS07 , SUS09 ) − ∑ ( SUS02 , SUS04 , SUS06 , SUS08 , SUS10 ) ) {\displaystyle SUS=2.5\left(20+\sum ({\text{SUS01}},{\text{SUS03}},{\text{SUS05}},{\text{SUS07}},{\text{SUS09}})-\sum ({\text{SUS02}},{\text{SUS04}},{\text{SUS06}},{\text{SUS08}},{\text{SUS10}})\right)} SUS has generally been seen as providing this type of high-level subjective view of usability and is thus often used in carrying out comparisons of usability between systems. Because...