Design

• Design = achieving goals within constraints
• Goals: What is the purpose of the design we are intending to

  produce? Who is it for? Why do they want it?
• Constraints: What materials must we use? What standard

  must we adopt? How much time do we have to develop it?

  Are they health and safety issue?
• Trade-off: Choosing which goals or constraints can be

  relaxed so that others can be met.
• THE GOLDEN RULE OF DESIGN

  Understand your materials
• Understand computers

  • Limitations, capacities, tools, platforms
• Understand people

  • Psychological, social aspect, human error.
• To err is human

  • Bad interfaces cost money and cost lives.

  • It is the nature of humans to make mistakes.

  • Systems should be designed to reduce the mistakes and to minimize the

  consequences when mistakes happen. (know how and where)
• The central message – the user

  • Core of interaction design : put the user first, keep the user in the center and

  remember the user at the end.