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Basically everything in Steve Blank's Four Steps to the Epiphany (another phrase for this is "business development")

If there is someone you are considering for a co-founder role, tell them to get the book and read it.

If they get the book and read it and come back a week later saying "holy shit lets get started", then you've found your non-technical co-founder.

If they complain about having to get a book and read it, you can forget them, they are wrong for the job.