An excellent resource that explores design process models across disciplines is: How do you Design - you can download it at: http://www.dubberly.com/articles/how-do-you-design.html
One way to interpret this work is that there are patterns that hold design together as a domain in itself...another interpretation is that there are also unique aspects or ways of design thinking that are embedded in disciplinary approaches to design.
Either way - it is a fascinating compendium.
Robin Adams
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