Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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I think there are *several* necessary but insufficient criteria (for example, power), and the more of them the more sufficient. I think formally decreeing something "sufficient" at all is dangerous, because that's what leads to people incentivized to hack it.
Agreed! Sufficiency is domain-dependent, based on level of insight gained. How many confounders are considered, is analysis causal vs. correlational, is explanation based on mechanisms or distributions.
Also weighting data vs. analysis. As Alan Baddeley (memory researcher) said: "I resolved that if I were to develop a theory, it would be based very closely on the evidence, which would survive even if the theory proved totally wrong."
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