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  7.13. McKay Thomas of First Opinion on Prototyping and Refining the Minimum Feature Set (3 min.)

McKay Thomas is the Founder/CEO of First Opinion, a text-a-doctor service, which has raised over $2.5 million to date. Thomas is also the Co-Founder of, the premier online retailer for baby supplies in Brazil.

In this video, Thomas describes how he identified his assumptions, cold-contacted customers, showed them prototypes of his ideas, and continued to refine his Minimum Feature Set down to the most essential features of the product.