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Usability > Guidelines - 1 of 1
 
 


Guidelines for Highly Usable, Complex Systems

There are many guidelines available for usability and human-centered design.  It is the role of the Human Factors specialist to select those most applicable to the task at hand and to judiciously apply them-not all guidelines fit all systems.  The guidelines presented in this module were selected as most applicable to FAA systems and are adapted from the work of Charles E. Billings.

  • Accountable
    • Must inform user of its actions.
    • Must be able to explain actions to user upon request.
  • Subordinate
    • Must never assume control, except in pre-defined situations.
    • Must be able to be countermanded in those situations.
  • Predictable
    • User must be able to anticipate and rely upon automation's actions. No surprises!  
  • Adaptable
    • Must be configurable within a wide range of user preferences and needs.
  • Comprehensible
    • Must be intelligible to the user.  Match user mental model.
  • Flexible
    • Must have a range of control and management options.
  • Dependable
    • Must do what it is ordered to do.
    • Must never do what it is ordered NOT to do.
    • Must never make situation worse.
  • Informative
    • Must keep the user informed of actions & system status.
  • Error-resistant
    • Must keep the user from making errors wherever possible.
  • Error-tolerant
    • Must detect and mitigate the effect of user errors.

  
 

 
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