What exactly does a "working knowledge" of something entail?  For
example, "Must have working knowledge of AP style."

Dear ppark-ga;

Thank you for allowing me to answer your interesting question. The
term ?working knowledge? typically means ?having enough fundamental
understanding to perform the task? and ?having a good knowledge of
related concepts, theories, principles, standards, frameworks,
procedures, etc.?

This is as opposed to the terms ?sound knowledge? which means ?well
founded, and reliable at performing a task? and ?comprehensive
knowledge? which entails a much broader range of knoweldge related to
detailed principles and theories regarding a task.

I hope you find that my answer exceeds your expectations. If you have
any questions about my research please post a clarification request
prior to rating the answer. Otherwise I welcome your rating and your
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near future. Thank you for bringing your question to us.

Best regards;
Tutuzdad-ga ? Google Answers Researcher



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Working knowledge means

You might also include "theoretical knowledge" in your list; this is
when you've book-learned something but never actually done it, like
when I was 8 and memorized my sister's driver's ed pamphlet and
decided I could drive Dad's Edsel.