Not to be flippant, but I'd say that there's really no such thing as "typical" roles and/or responsibilities. Roles and responsibilities are as individual as the organizations seeking services and the problems needing to be solved. Worse (ironically?), one of the biggest problems that frequently — possibly even usually — needs to be solved is understanding the actual problem to be solved. If the customer fully doesn't understand the problem (and what constitutes successfully solving it), there's pretty much no way they can engage a consultant/consultancy and reasonably expect success.
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