Oh, so simple a question, yet the answer is so fraught with difficulties.
Having been faced with this question three times in as many weeks, I decided to write a short piece that I could attach to an email and send if asked again - but of course there is no short answer for so many elements depend one on another.
What I ended up with is longer than even I anticipated, so long in fact that I've given it its own Page on this site. If you really want the answer have a look. It will probably put you off for life.
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My long and short fiction skirmishes through Mythic Fiction, Paranormal, Horror, Thriller, Crime, Historical, Literary, SF, Fantasy, Mainstream, Romance and Western. Sign up for my new releases Newsletter or Follow the Blog by email as I chat about all things writing related.