Have you received rejections from editors or agents?

Has your manuscript been criticized for lack or misuse of certain fiction writing techniques?

Have you read how-to books, articles, and attended workshops but have doubts about whether or not you're employing those techniques correctly?

—Shorten the time it takes to learn a writing skill

—Act as a visual aid and jog your memory about
an element of fiction

—Reaffirm that you're following proper techniques
which you've read about in how-to books

—Enhance and organize your own notes on
writing techniques and craft

—Hone a skill you've already learned

—Remind you of what you heard in a workshop on the subject
and thus allow you to watch for it in your writing

—Guide you through a rewrite or the revision process

—Enable you to submit more professional manuscripts 

Usually a Cheat Sheet folds into a half-sheet (5.5" x 8") and resembles a booklet.

A Cheat Sheet normally begins with a definition or succinct explanation of the writing technique or element that it covers.

Depending on the topic, a Cheat Sheet may also contain checkoff boxes or bulleted lists, some even contain "visual aids"--drawings or diagrams.  All of these are designed so the writer doesn't miss an element or forget a sequence of the technique.