Composer Collaboration

I’ve never done it before, but I’m going to need to do it soon.

For those of you who’ve used assistant composers–any tips on how to organize it? Do you start off a cue and then let the assistant finish? Do you provide the theme or a few notes?
How do you coordinate having a similar composing palate or virtual instruments?
For that matter, is “assistant composer” the right term?  Is “ghost-writer” better?

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