Principles of HCI Design

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Principles of HCI Design
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Don't go to the right?
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Where do you plug in the mouse?
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Traditional Software Design

• Waterfall model of software life cycle

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User Centered Design

• There should not be a black box for the user!
• The User SHOULD
• Drive all user interface design decisions
• Determine goals and set priorities
• Agree upon all goals that will be used in
  designing the user interface

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User-Centered Project Life Cycle
User/Task Analysis I Set Usability Goals I Design
Interface I Evaluate Designs I Build
Prototype I Test Prototype
Test Okay?
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Iteration is the key!

• No design will be perfect in the first time.
• Interactive systems cannot be completely
  specified from the beginning of the life cycle.
• Users need to be involved all the time.
• Evaluation and testing should be done throughout
  the design process.
• Design and testing should be repeated
  iteratively.
• Prototypes, rather than real systems, can be used
  for testing.

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How to Start?

• Intelligent Borrowing
• Plagiarizing or Good Design Practice
• http//www.freewebtemplates.com/
• Getting to Know Existing Frameworks
• Guidelines and standards
• IBM Web Design Guidelines (http//www-3.ibm.com/ib
  m/easy/eou_ext.nsf/publish/558)
• Ameritech User Interface Standard(shttp// www.
  ameritech.com1080/corporate/testtown/library/stan
  dard/index.html)

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Getting started

• Getting to Know Existing Frameworks
• Convention
• User is already familiar with the process or
  arrangement from other interfaces
• Most of user interface design requires designers
  to work within the tight constraints of existing
  designs

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• Studying existing applications
• look at systems users already know
• Copy interaction techniques
• copy the style of menu selection, organization of
  screen elements, etc. (where appropriate)
• Understand why design was done in the way it was
  done with the existing interface

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Methods of Iterative Design

• Scenario Generation
• Choosing Representative Scenarios
• Comprehensive
• Critical Task
• Random
• Scenario Validation Review
• Key stakeholders first
• Group reviews later

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Methods of Iterative Design

• Deriving Storyboards from Scenarios
• Paper Prototyping
• Explore constraints
• Study standards guidelines

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Methods of Iterative Design

• Building an interactive rapid prototype from a
  paper prototype.
• Testing the Prototype with Users.
• Iteration Control
• Each iteration has a specific usability goals.

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Prototype