Having spent over 2 decades in the design field, I now work closely with Google to conduct design thinking based 'design sprints'.

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Based on IDEO's process, Google's Jake Knapp formulated their own version of a systematic approach to rapid prototyping - quickly building a flow of a website / app / service through low and high fidelity mockups, running them through checks and feedback loops and creating iterative improvements to the product or service.

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I'd be happy to provide references.