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To me this is the most important thing i have learned in 15 years of coding. Its also the reason why I hate interview "tests", I don't come up with a good design straight away. I prefer to get in idea of what is needed, then think about it for a few days while working on other stuff.

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If someone uses interview tests in that way they're doing it wrong.

That's not what interview tests are for; they're for demonstrating a base level of competence and how you think about code during a discussion of the code. Also for acting as a catalyst for more discussion about programming.

You are so right. Good design doesn't just pop out of nowhere. It does emerge early on, but requires work and time while the complexities of the problem are groked.

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