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System usability and measuring
       user satisfaction
issues
• 2 main issues in software quality
  – Validation
     • User satisfaction
  – Verification
     • Quality assurance
Usability testing
• ISO defines usability as
   – Effectiveness
   – Efficiency
   – Satisfaction
   With which a specified set of users can achieve a set of
     tasks in particular environments
• ISO requires
   – Defining tasks
   – Defining users
   – A mean for measuring effectiveness, efficiency,
     satisfaction
Usability testing
• Definition
  – Measures the ease of use as well as the degree of
    comfort and satisfaction users have with the
    software
  – Testing begins in the early stages of product
    development
OOA use case model




   Quality            User
                                       Usability
assurance test    satisfaction
                                      test cases
    cases          test cases
Guidelines for developing testing
• Include all of a software components
• Need not be very expensive or elaborate
• All subjects need not involve all subjects
• Design problems can be studied with few
  users
• Apply testing early and often
Recording the usability test
• Provide comfortable location for participants
• Don’t interrupt participants
• Record the techniques and search patterns users
  employ when attempting to work through a difficulty
• Record the time taken to perform a task, and
  problems faced by them
• Record the results using portable tape recorder or
  camera
• This is followed by user satisfaction test and
  questionair
User satisfaction test
• Process of quantifying usability test with
  measurable attributes of the test such as
  functionality , cost or ease of use
  – Ex: 90 5 of the people should know to withdraw
    money from ATM without training or error
objectives
• Used as communication vehicle bw designers,
  and also bw users and designers
• To detect and evaluate changes during the
  design process
• To provide a periodic indication of divergence
  of opinion about current design
Guidelines for developing user
            satisfaction test
• Must work with users or clients to find out
  what attributes should be included in the test
• Limit the number of attributes
• some attributes are
  – ease of ues
  – functionality
  – Cost
  – reliability
Tool for user satisfaction test
• Commercial Off the Shelf (COTS)
• User Satisfaction Test Spreadsheet (USTS)

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Unit 5 usability and satisfaction test

  • 1. System usability and measuring user satisfaction
  • 2. issues • 2 main issues in software quality – Validation • User satisfaction – Verification • Quality assurance
  • 3. Usability testing • ISO defines usability as – Effectiveness – Efficiency – Satisfaction With which a specified set of users can achieve a set of tasks in particular environments • ISO requires – Defining tasks – Defining users – A mean for measuring effectiveness, efficiency, satisfaction
  • 4. Usability testing • Definition – Measures the ease of use as well as the degree of comfort and satisfaction users have with the software – Testing begins in the early stages of product development
  • 5. OOA use case model Quality User Usability assurance test satisfaction test cases cases test cases
  • 6. Guidelines for developing testing • Include all of a software components • Need not be very expensive or elaborate • All subjects need not involve all subjects • Design problems can be studied with few users • Apply testing early and often
  • 7. Recording the usability test • Provide comfortable location for participants • Don’t interrupt participants • Record the techniques and search patterns users employ when attempting to work through a difficulty • Record the time taken to perform a task, and problems faced by them • Record the results using portable tape recorder or camera • This is followed by user satisfaction test and questionair
  • 8. User satisfaction test • Process of quantifying usability test with measurable attributes of the test such as functionality , cost or ease of use – Ex: 90 5 of the people should know to withdraw money from ATM without training or error
  • 9. objectives • Used as communication vehicle bw designers, and also bw users and designers • To detect and evaluate changes during the design process • To provide a periodic indication of divergence of opinion about current design
  • 10. Guidelines for developing user satisfaction test • Must work with users or clients to find out what attributes should be included in the test • Limit the number of attributes • some attributes are – ease of ues – functionality – Cost – reliability
  • 11. Tool for user satisfaction test • Commercial Off the Shelf (COTS) • User Satisfaction Test Spreadsheet (USTS)