Once you see that an answer is not serving its question properly anymore, it should be tossed away. It's just their natural life cycle.
They usually kick and scream, raising one hell of a ruckus when we ask them to leave. Especially when they have been with us for a long time.
You see, too many actions have been based on those answers. Too much work and energy invested on them. They feel so important, so full of themselves. They will answer to no one. Not even to their initial question!
The hardest thing about customer interviews is knowing where to dig. An effective interview is more like a friendly interrogation. We don’t want to learn what customers think about the product, or what they like or dislike — we want to know what happened and how they chose... To get those answers we can’t just ask surface questions, we have to keep digging back behind the answers to find out what really happened.
In the terrific documentary about his work, The Secret Life of Lance Letscher, the collage artist points out that he doesn’t want his file boxes of source material organized too much, that he specifically avoids organizing them, so that he can find unexpected things when he starts searching. “He depends upon that chaos of stuff, of things lying around.”
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There are several paragraphs in Murch’s book about the importance of fighting against the touted “features” of digital tools, such as speed. “The real issue with speed,” he says, “Is not just how fast can you go, but where are you going so fast? It doesn’t help to arrive quickly if you wind up in the wrong place.”
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If I was simply able to execute a full-text search on my notebooks, and pull up exactly what I was looking for, that’s all I’d find: exactly what I was looking for. And the real art is in finding what I didn’t know I was looking for.