HCI Processes 1 Overview of HCI Design

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HCI Processes 1Overview of HCI Design

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Agenda

• Questions
• HCI Processes
• Focus on software engineering

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Why is HCI Design Difficult

• Difficult to deeply analyze human behavior
• May be too close to the domain
• Multiple clients
• Co-evolution makes it even harder

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HCI Processes

• Iterative Design
• Usability Engineering
• Participatory Design
• Contextual Design
• Scandinavian School

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Before or after ..

• Formative
• Strategies to build a better interface
• Summative
• Assessing an existing interface

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Formative techniques

• Apply principles
• Dont assume the user is right-handed
• Build prototypes
• Apply design rules / standards
• Java look and feel
• Create usability specifications
• The XYZ dialog takes lt 5 sec.

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Summative techniques

• Empirical / laboratory evaluation
• Expert review
• Field study
• Client review

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Software Engineering

• the structured application of scientific
  techniques to the development of software
  products
• Why SE?
• Complexity of large-scale systems
• legacy systems

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Software Life cycles Waterfall Model
RequirementsSpecification
ArchitecturalDesign
Detailed Design
Coding andUnit Testing
Integrationand Testing
Operation and Maintenance
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Activities in the Life Cycle

• Requirements specification
• what will the system do
• Design
• architectural, functional, detailed
• Coding and Unit Testing
• Integration Testing
• verification and validation
• Operation and Maintenance

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Software Life cycles Iterative Waterfall Model
RequirementsSpecification
ArchitecturalDesign
Detailed Design
Coding andUnit Testing
Integrationand Testing
Operation and Maintenance
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Why waterfall fails

• You cant determine all requirements from the
  start
• Some tasks will only be known after the user has
  interacted with the system
• Users will perform tasks that werent intended by
  the designer
• Doesnt support the users perspective of the
  system

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Work with project groups

• Establish groups if you havent already
• Talk about what problem/people you are going to
  study
• Talk to me about your project
• Assign people to work on IRB approval,
  Co-Web/project web page, arrange meeting times

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Upcoming

• More Design Process (DFAB 5.4 5.6)
• Part 0 Due Wednesday 1/15
• HW 1- IRB Certification due Friday 1/17