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Human-Computer Interaction 9
HCI University of Zürich
12
Computer Science
Undergraduate 1
01/04/2017

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Term
 Human time limits
Definition
 0.1 s user feels that the system reacts instantaneously1 s users flow of thought stays uninterrupted10 s users attention still with the dialogue
Term
 What does GOMS-KLM operations mean?
Definition
 Goals, operators, methods, selection rules - keystroke-level model
Term
 What are the different GOMS-KLM operations? How long do they take?
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
Term
 What are the mental operator rules?
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 terminators2. Add M in front of each P or P1 except:- anticipated clicking right after pointing- selecting an argument of a command3. Remove M that overlaps with R(t)
Term
 Fitts law formula explained
Definition
 [image]
Term
 What is the Hick-Hyman law
Definition
 Estimating reaction time when making choices
Term
 Hick-Hyman law formula explained
Definition
 [image]
Term
 Fitts law definition
Definition
 Estimating movement time in pointing devices
Term
 Beating Fitts' law
Definition
 - Mouse acceleration- Expand the target when mouse in nearby
Term
 What if theres a function in Screen edges?
Definition
 width = infinity
Term
 Beating Hick-Hyman Law
Definition
 - Show recent items at the top- Adapts visibility & ordering based on the context
Term
 Information-theoretic efficiency
Definition
 [image]
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