2 resources from HBR IdeaCast we point founders to, and the questions each answers.
🎧 Podcast
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Christensen tells the milkshake story himself: McDonald's asked customers directly how to improve the milkshake and got useless answers, until they asked what job people were hiring the milkshake to do on their commute. It is the clearest illustration available of why the right question about the past beats a direct question about preferences.
A deeper follow-up conversation on the same theory, with more of the reasoning behind why circumstance matters more than customer category. Good second listen once you already know the milkshake story and want the mechanics behind it.