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The third need is for better theory.

We should expect that general phonologic theory should be as adequate for tone as for consonants and vowels, but it has not been.

This can only be for one of two reasons: either the two are quite different and will require totally different theory ( and hence techniques ), or our existing theories are insufficiently general.

If, as I suspect, the problem is largely of the second sort, then development of a theory better able to handle tone will result automatically in better theory for all phonologic subsystems.