Hard to vary

A hard-to-vary explanation provides specific details that fit together so tightly that it is impossible to change any detail without affecting the whole theory.

A Good Explanation is hard-to-vary whereas a with a Bad Explanation you could vary the details without affecting the explanation.

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Bad Explanation

A bad explanation is unspecific. You can change any or all of the details without destroying it. Examples of bad explanations:

Good Explanation

A good explanation is Hard to vary while still accounting for what it purports to account for.