Re:Parallel vs serial
I agree testing multiple designs is a great way to iterate on an idea.
You may be interested in an upcoming prototyping book by Todd Zaki Warfel published by Rosenfeld Media.
Todd discusses the value of multiple designs and testing out a hypothesis early and often.
Quotes from the book
"Prototypes are a great communication tool for fleshing out design ideas, testing assumptions, and gathering real-time feedback from users."
"If a picture is worth a thousand words, than an interactive prototype is worth 10,000. Prototypes have the power to show, not just tell."
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