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Full Idea
The criterion of an explanation is whether the symbol explained is used properly in the future.
Gist of Idea
If an explanation is good, the symbol is used properly in the future
Source
Ludwig Wittgenstein (Lectures 1930-32 (student notes) [1931], B II.4)
Book Ref
Wittgenstein,Ludwig: 'Lectures in Cambridge 1930-32', ed/tr. Lee,Desmond [Blackwell 1980], p.27
A Reaction
This appears to be a pragmatic criterion for the best explanation. It presumably rests on his doctrine that meaning is use, so good explanation is understanding meanings.