Term
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Definition
0.1 s user feels that the system reacts instantaneously
1 s users flow of thought stays uninterrupted
10 s users attention still with the dialogue |
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Term
| What does GOMS-KLM operations mean? |
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Definition
| Goals, operators, methods, selection rules - keystroke-level model |
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Term
| What are the different GOMS-KLM operations? How long do they take? |
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Definition
K = keying (0.35 s)
P = pointing (1.1 s)
P1 = clicking (0.2 s)
H = homing hand between keyboard and mouse (0.4 s)
M = mental operation (1.35 s)
R(t) = response time from computer on a task t |
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Term
| What are the mental operator rules? |
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Definition
1. Add M in front of each K, except
- inside on e cognitive unit (e.g. characters in one word, digits and decimal point in on number)
- terminators that are always present
- consecutive terminators
2. Add M in front of each P or P1 except:
- anticipated clicking right after pointing
- selecting an argument of a command
3. Remove M that overlaps with R(t) |
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Term
| Fitts law formula explained |
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Definition
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Term
| What is the Hick-Hyman law |
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Definition
| Estimating reaction time when making choices |
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Term
| Hick-Hyman law formula explained |
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Definition
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Term
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Definition
| Estimating movement time in pointing devices |
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Term
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Definition
- Mouse acceleration
- Expand the target when mouse in nearby |
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Term
| What if theres a function in Screen edges? |
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Definition
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Term
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Definition
- Show recent items at the top
- Adapts visibility & ordering based on the context |
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Term
| Information-theoretic efficiency |
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Definition
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