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The struggle for me seems to be knowing how much is too little and how much is too much. Do you try to err on the side of doing too little at first?

Well, that's a bit like saying "how much science should I use?" There's not really such a thing as "too much science" more like "bad science" or "too expensive science." The key, to me, is to pick an experiment that is well tuned to your circumstance: the right cost, timeline, hypothesis, and clear action for next steps.

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