GDPA  
Usability  

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Identification

Usability

Definitions/Uses

1993
Reference /Nielsen J., 1993/ Usability Engineering
Definition/
Use		 The attributes of usability:
  • Learnability: How easy is to learn the main system functionality and gain proficiency to complete the job.

  • Efficiency: The number of tasks per unit of time that the user can perform using the system

  • User retention over time: This attribute reflects how well the users remembers how the system works after a period of nonusage.

  • Error rate: It addresses the number of errors the user makes while performing a task.

  • Satisfaction: This shows a user's subjective impression.
    • 1992
    Reference ISO 9241: 1992, Part 11. Ergonomic requirements for office work with visual display terminals
    Definition/
    Use    		 The extend to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use.
    1990
    Reference IEEE Std 610.12-1990. IEEE Standard Glossary of Software Engineering Terminology
    Definition/
    Use    		 The ease with which a user can learn to operate, prepare inputs for, and interpret outputs of a system or component.

    GDPA Online Last Updated 01.Jan.2002 Updated by Webmaster Last Revised 01.Jan.2002 Revised by Webmaster