Book excerpt: Clear, concise, effective, THE RANDOM HOUSE GUIDE TO GOOD WRITING is for anyone who wishes to communicate well in writing. Mitchell Ivers shows us how to master the medium and the message with an array of features: Precise guidelines on word usage, grammar, and punctuation--and how to decide with "rules" you can discard to suit your purpose; How to choose the tone and style appropriate to your audience and subject; The essential components of plot in fiction and structure in nonfiction, and much more. An Alternate Selection of the Book-of-the-Month Club A Main Selection of the Writer's Digest Book Club