Mobile HCI

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• Mobile HCI

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What is HCI ?

• Interaction or Interface ?
• Interface describes the physical aspects of a
  computer-based system which the user experiences
  directly.
• HCI is a broader, interdisciplinary field which
  is
• concerned with the design, evaluation
  implementation of interactive computing systems
  for human use and with the study of major
  phenomena surrounding them (ACM SIGCHI)
• The goals of HCI are to develop or improve the
  safety, utility and effectiveness of systems that
  include computers, often through improving
  usability .

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Why is Usability important ?

• Usability concerns how easy and intuitive a
  system is to use. Without it there can be
• User frustration
• Stress
• Users may reject the application or device
• Increased errors - what IS an error ?

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Usability Utility

• Utility concerned with what the system does
• if systems dont do what users want, then no
  amount of interface design will turn them into
  good systems
• Usability concerned with how the functionality is
  implemented
• poorly designed interfaces can destroy a
  potentially useful system

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Definitions of Usability

• Usability can simply be thought of as the
  practical implementation of good HCI, but, more
  formally
• The usability of a system is the extent 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.
• ISO 9241-11 (International Standards
  Organisation)
• (See also ISO 14915 - Design of the User
  Interface of Multimedia Applications
• and ISO 13407 - Human-centred Design
  Processes for Interactive Systems)

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Various Interactions
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Watches
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What do we define as mobile
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Miniature Head-up Displays
MicroOptical prescription display eyeglasses
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Mobile Usability

• The device itself
• The applications on the device

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Device

• Issues include
• Battery life
• Footprint
• Modification
• Physicality
• Environment etc

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Programs

• Interface design
• Interaction design
• usability

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Dimensions of Usability

• Does the user feel in control of the application
  ?
• To what extent can the user achieve their goals
  using the application ?
• How far does the product appear to assist the
  user ?
• How easy is the application to learn ?
• How does the user respond emotionally ?

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Unique and Hard

• Mental models
• No of Handheld devices
• Used more and more frequently
• Environments etc

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Lots of Phones
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Anytime Anywhere
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Whats Next

• In the next lecture from me we will
• Breakdown HCI
• How do we carry out usability testing etc