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GOMS Analysis on the back of the envelope

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The GOMS keystroke level model is a simple technique that allows you to quantitatively compare the efficiency of alternative designs. Its powerful, compelling and can be done in a few minutes yet most UX professionals have never heard of it.

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GOMS Analysis on the back of the envelope

1. 1. GOMS analysisOn the back of the envelope
2. 2. GOMSIs not a venereal disease...
3. 3. GOMSIt is a simple technique for quantitativelycomparing the efficiency of designsBTW… when I say GOMS I meanGOMS keystroke level Model(KLM or KLM-GOMS)Use it in conjunction with yourqualitative tools
4. 4. Youll need the following tools + + +
5. 5. A quick story... Deutsche Bank Trading Floor London 2011
6. 6. Numbers are compelling
7. 7. When to use GOMSThere are 3 reasons you might want to useGOMS analysis:1. Speed matters2. You need to convince stakeholders3. You want to become a better designer
8. 8. The premiseThe time taken to perform a task is the sum ofthe time it takes to perform the elementarygestures that make up that task
9. 9. The steps1. Define the task2. Break it down into its gestures3. Apply mental operators4. Add up the numbers
10. 10. 1. Define the taskKLM models the interaction of an experienceduser doing a defined task.
11. 11. 2. Break it down into its gesturesKLM has a basic set of gestures; each with atypical time assigned to it - which is sufficientfor comparative analyses.
12. 12. 2. Break it down into its gesturesKeying (K) = 0.2 sec
13. 13. 2. Break it down into its gesturesPointing (P) = 1.1 sec
14. 14. 2. Break it down into its gesturesHoming (H) = 0.4 sec
15. 15. 2. Break it down into its gesturesMentally preparing (M) = 1.35 sec
16. 16. 2. Break it down into its gesturesResponding (R) = n sec
17. 17. 3. Apply mental operatorsThe hardest part of KLM. But it all comes downto chunking. Gestures Chunk Chunk ChunkM + Chunk M + Chunk M + Chunk
18. 18. 3. Apply mental operators M + HPKHelen of Troy: M + KKKKKKKKKKKKKKK356.34: M + KKKKKKKLM: M+ K M+ K M+ K
19. 19. 4. Add up the numbers HMPK 0.4 + 1.35 + 1.1 + 0.2 = 3.05 sec