Looking for a no-cost, high-return way to boost employee productivity? Try some praise. Our Esquire Guy columnist Ross McCammon offers these tips on how to give meaningful positive reinforcement. He runs down a list of key technical matters -- including mistakes to avoid when giving work-related compliments. Want to amp up the positive impact? Try putting it in a hand-written note.

Related: The Power of Praise in Business -- and How to Do it Right