You need the first five interviews just to truly understand the white space and the current opportunity. Yes, you probably think you already understand it. But you are the vendor, not the purchaser. You need to understand your prospective app from the purchaser's perspective, for real. You need the next five interviews to confirm your pattern recognition. You learn from the first five; you confirm in the next five. You need interviews 11–20 to nail your pitch and hone your thesis. Once you truly understand the white space from a buyer's perspective, and you've figured out the nuances and
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