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 (and receive a useful freebie) or Follow the Blog by email as I chat about all things writing related.