Five must-do, but rarely revealed, tips to create a TED Talk or presentation that is polished, engaging, and unforgettable.

The key to any good presentation is preparation ... You might want to use graphs, charts or quotes to support your ideas. Or maybe you have some research to support your points.

If your salespeople aren't effective presenters, they'll never achieve their full potential, even if they're already good at selling. Which is why it's critical that you understand and monitor this ...