Describe the user interface designers tool known as the ‘Model Human Processor'



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describe the user interface designers tool known as the ‘Model Human Processor',

  • describe the user interface designers tool known as the ‘Model Human Processor',

  • describe how the model will be applied to a user interface



a (theoretical) user interface design tool,

  • a (theoretical) user interface design tool,

    • developed by Card, Moran and Newell in 1983
  • based on cognitive processing:

    • ‘thinking & remembering’
    • if we knew how we remembered things, then we should be able to produce an interface which the user would be able to remember
  • if it works like you think it should then ….



quantify the cognitive process that users go through between perception and action:

  • quantify the cognitive process that users go through between perception and action:

    • what happens between the user seeing/hearing and doing?
  • link how a human remembers and how a (computer) system should operate:

    • the last time I saw/heard that it meant ..... and I needed to …..


Consists of three interacting systems:

  • Consists of three interacting systems:

  • perceptual processor

    • visual/audio storage
    • seeing & hearing
  • cognitive processor

    • working memory
    • identify link to mental models & past experience
  • motor processor

    • carry out actions
  • See it ….. work out what to do ….. do it!



perceptual processor = inputs

  • perceptual processor = inputs

  • working memory = RAM

  • long-term memory = secondary storage (HDD …)

  • cognitive processor = CPU

  • motor processor = outputs



theory based on human information processing

  • theory based on human information processing

  • describes the cognitive process that people go through between perception & action

    • seeing/hearing  doing


draws an analogy between the processing and storage of a computer with

  • draws an analogy between the processing and storage of a computer with



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event  determine response



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event  determine response  physically respond



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event  determine response  physically respond

  • a visual or audible stimulus is seen (or heard)



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event  determine response  physically respond

  • a visual or audible stimulus is seen (or heard)

    • attention drawn to a dialogue box on screen (beep)


draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event  determine response  physically respond

  • a visual or audible stimulus is seen (or heard)

    • attention drawn to a dialogue box on screen (beep)
  • the physical attributes of the stimulus are decoded



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event  determine response  physically respond

  • a visual or audible stimulus is seen (or heard)

    • attention drawn to a dialogue box on screen (beep)
  • the physical attributes of the stimulus are decoded

    • human interprets the response needed


draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event  determine response  physically respond

  • a visual or audible stimulus is seen (or heard)

    • attention drawn to a dialogue box on screen (beep)
  • the physical attributes of the stimulus are decoded

    • human interprets the response needed (what should I do?)
  • a motor response is initiated



draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • draws an analogy between the processing and storage of a computer with the perceptual, cognitive, motor and memory activities of a human

  • see/hear  recognise event  determine response  physically respond

  • a visual or audible stimulus is seen (or heard)

    • attention drawn to a dialogue box on screen (beep)
  • the physical attributes of the stimulus are decoded

    • human interprets the response needed (what should I do?)
  • a motor response is initiated

    • clicks a button with mouse ….


  • a flashing cursor will indicate where the user is to enter data

  • a beep may sound when a mistake is made

  • a logical order to the inputs will be employed



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