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Task-specific preference for numeric keypads.

H R Straub1, M M Granaas

  • 1Human Factors Laboratory, University of South Dakota, 414 E. Clark, Vermillion, South Dakota 57069-2390, USA.

Applied Ergonomics
|August 1, 1993
PubMed
Summary
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User preferences for numeric keypads depend on the task. The telephone (TEL) keypad is preferred for phone numbers (82%), while the adding machine (ADD) keypad is preferred for calculations (50%).

Area of Science:

  • Human-Computer Interaction
  • Usability Engineering
  • Cognitive Psychology

Background:

  • Numeric keypads are ubiquitous in user interfaces.
  • Two common numeric keypad layouts exist: the adding machine (ADD) and telephone (TEL) arrangements.
  • Understanding user preferences for different tasks is crucial for effective interface design.

Purpose of the Study:

  • To investigate task-specific user preferences for ADD and TEL numeric keypads.
  • To determine if user preferences align with specific numerical entry tasks.
  • To explore the implications of task-specific preferences for keypad design.

Main Methods:

  • 100 subjects were presented with eight distinct numerical entry scenarios.
  • Subjects chose between ADD and TEL keypads for each scenario.

Related Experiment Videos

  • A repeated-measures ANOVA was used to analyze preference data.

    • Main Results:

    • A significant main effect of scenario on keypad preference was found.
    • The TEL keypad was highly preferred for telephone number entry (82%).
    • Preference for the TEL keypad decreased significantly for mathematical calculations (50%).

    Conclusions:

    • User preferences for numeric keypads are demonstrably task-specific.
    • Task-specific preferences suggest potential for task-specific performance differences.
    • Incorporating task-specific preferences can inform more effective keypad design.