Don't use no double negatives. The passive voice is to be ignored. Eliminate commas, that are, not necessary. Never use a big word when a diminutive one would suffice. Use words correctly, irregardless of how others use them.
Exaggeration is a billion times worse than understatement.
Proofread carefully to see if you any words out. Most writers regard truth as their most valuable possession, and therefore are most economical in its use. This year it is Peter Drucker's Management Challenge for the 21st Century. Guaranteed to give you a fresh perspective on the world of business and your career. In our technobabble times, his business primer only gets more relevant.