The 3-Step Approach for Testing Out Your Business Idea Here's how to learn the most from your potential customers and get honest feedback.

Let's say you wake up one day and decide the world needs a better mop, and you're just the person to make it. Before setting out, you interview prospective customers. "Are you looking for a better mop?" you ask someone. The person searches his memory for all the times he's wrestled with a mop or hated the smell of it, and he ignores the fact that most days he doesn't care about his mop and can't even remember the last time he used it. The hits, not the misses, fill his mind. "Yes," he tells you. "I am looking for a better mop." You're thrilled to hear that and go off to design it. Eight months later, with $20,000 of R&D money invested, you come back and ask him to buy it. "Nah," he says. "I've already got a mop."

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What happened there? First, something psychologists call "confirmation bias." It's the tendency to look for information that confirms your beliefs and ignore what doesn't. And second, "positive test strategy," when we consciously or unconsciously ask questions that generate answers supporting our beliefs. These phenomena working in tandem make us feel more reassured, self-confident and driven, but they also create traps for entrepreneurs and prevent us from getting good, honest feedback from our customers.