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There's generally a mix, from advanced undergrads to professional 'sub-academic' types, many of whom even have PhDs, etc., and work permanently in these roles. While the expertise of graduate students is generally highly questionable ...
... even very competent assistants can't help you as much as you'd like. You still have to understand the whole project, and everything that everyone is doing; generally assistants are reluctant to make too many autonomous decisions ...
... so you end up developing weird internal procedures about what to do in ever more rarefied cases.
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