CPT208 Design Life Cycle

Human-Centric Computing

The Design Life Cycle
It’s a interface/interaction design - an iterative process:
design –> implementation –> evaluation –> design

• not always start with design
  • maybe first figure out what people need/want (evaluation)
  • maybe there was an initial system (implementation)
• quite expensive having to re-implement a (complex) system over and over
• better strategies needed-ideas?
  • different types of “implementation”
  • different degrees of evaluation

为什么要有interface design process?

• to avoid user frustration with the finished product
• to avoid unnecessary costs during product development 减小产品开发过程中不必要的开销
• to avoid additional cost after product development 减小产品开发后的多余开销
• reasons for going over budget
  • user-requested changes
  • overlooked tasks
  • users did not understand their own requirements
  • insufficient user-developer communication and understanding

Foundations for designing interfaces

• Understanding users and their tasks
  • Task-centered system design
    • how to develop task examples
    • how to evaluate designs through a task-centered walk-through
• Designing with the user
  • User-centered design and prototyping
    • methods for designed with the user
    • low and medium fidelity prototyping
• Evaluating interfaces with users
  • the role of evaluation in interface design
  • how to observe people using systems to detect interface problems

Considerations when designing interfaces
do I know who my user and what their tasks are?

• how much computer knowledge?
• novice? occasional user? regular user? expert?
• what do people want to achieve, what are the tasks?

novel interfaces: what hardware I can expect?

Storyline Visualization
Design Principles

• D1 Lines in the same group should appear next to each other.
• D2 Otherwise, lines must be far away from each other.
• D3 A line must remain straight unless its group changes.

Optimization Goals

• reducing line crossings
• reducing line wiggles
• reducing white space