Most advice says to specialize without hesitation, but the research tells a more interesting story. Here is what a 15-year study of more than 1,500 groups shows about whether you should niche down, plus a simple way to test a niche before you commit.

Toxic employees are often the most skilled people on the team, which is exactly why they get kept too long. Here's what Harvard research actually shows about the cost, the honest signs it's time to fire a problematic employee, and how to make the decision well.

Revenue is visible. The real cost of a draining client almost never is. Here's the data on what the wrong client actually costs you, the honest signs it's time to let them go, and how to do it cleanly, including the story of a founder who scaled from seven figures to eight by doing exactly that.