HCI 2 (Human Capabilities: I/O)

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  1. State and explain Fitts Law
    • Use: predicts that the time required to rapidly move to a target area
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  2. List the 4 Gestalt grouping principles and give examples.
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  3. Name some perceptual constraints and other factors
    • cultural and learned factors
    • underlying domain knowledge of users
    • need to reflect on logical structure (placement and grouping according to function, sequency and frequency of use)
    • dependance on task to be carried out (getting overview vs. seek specific information)
  4. What are the types of memory?
    • STM / LTM
    • Declarative / Procedural
  5. MHP (might not be needed for exam)
    might not be needed
  6. List the limitations of LTM (long term memory)
    • not everything is stored (filtering process)
    • not everything stored can be retrieved (recall process)
    • not everything recalled is correct (interference process)
  7. Name and explain the two different kinds of declarative memory
    • episodic: knowledge of facts -what happened, where and when
    • semantic: factual information, general knowledge independent of context
  8. Explain procedural memory
    • how-to-do-it knowledge
    • Usually implicit, hard to put into words - hence non-declarative (e.g. how to ride a bike)
  9. Explain semantic nets
    • A semantic net models declarative memory, by organizing memory into a network with links expressing strength or type of relationship between nodes, may be hierarchical
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  10. Describe schemas in the ddeclarative model
    Schemas: are pre-existing kowledge structures that shape our memomory of new inputs (may improve recall but also bias of memory)

    Frames: knowledge is organised into data structures with fixed, default and variable slots or attributes

    Scripts: stereotypical knowledge about situations that allows interpretation of partial description or causes (restaurant example)

    Note: Schemas may develop as abstractions of specific experiences (episodic memory) <-> Our memor might be shaped by specific expereriences
  11. How is procedural emory modeled?
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    • Estimate complexity and completion time of task from number of production rules per task.cognitive load depends on how much working memory rules take up.
  12. LTM discussion
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  13. Explain STM (short term memory, 3 points)
    • 1. Capacity: 7+-2 chunks of info
    • 2. Working memory: "Registers" of cognitive processor (data from perceptual subsystems, activated "chunks" of LTM)
    • 3. "Cognitive Load": of task is how much we have to keep in mind - attention bottleneck
  14. State ad explain two different learning equations (Power Law of Practice / Heathcote)
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    • Heathcote (2000):
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  15. Describe Markovs Decision Process
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  16. Define Learnability and list the 5 subcriteria
    Learnability - the ease with which new users can begin effective interaction and achieve maximal performance

    • Predictability
    • Synthesizability
    • Familiarity
    • Generalizatbility
    • Consistency
  17. Predicability details
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    • +support user to determine effect of future action based on past interaction history (beispiel textlupe)
  18. Synthesisability details
    • Synthesisability: support for the user to assess the effect of past operations on the current state.
    • Specifically, they can assess if the outcome is better or worse than expected (are they making progress towards the goal?)Immediate vs. eventual honesty

    • Advantage of WYSIWYG - What you see is what you get
    • Difficult learning situations involve long chains of states and actions before any reward is received
  19. Familiarity details
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    • problem: agreement can be very low
  20. Affordance explanation
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Card Set:
HCI 2 (Human Capabilities: I/O)
2013-05-13 14:36:12
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