Marissa Mayer lays down the law at Yahoo

Mayer’s rule: If a new product can’t be shipped in six months, and if it doesn’t have a realistic shot of reaching 100 million users or generate $100 million toward the company’s top line, then Yahoo will no longer bother.

It’s no secret that I like Mayer and it’s because of things like this. Tell your employees what you want and expect them to meet those expectations.