Universal Principles of Design, Revised and Updated
by William Lidwell, Kritina Holden, Jill Butler
Development Cycle
Successful products typically follow four stages of creation: requirements, design, development, and testing.
All products progress sequentially through basic stages of creation. Understanding and using effective practices for each stage allows designers to maximize a product’s probability of success. There are four basic stages of creation for all products: requirements, design, development, and testing.1
Requirements
In formal processes, requirements are gathered through market research, customer feedback, focus groups, and usability testing. Informally, design requirements are often derived from direct knowledge or experience. Design requirements are best obtained through controlled interactions between designers and members ...
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