Trying to get a raise or promotion this year? Anyone can tell you it comes down to more than your skills and achievements (and office politics).

One element you might be overlooking is how you communicate.

Communication skills are a huge factor in “who gets promoted and why they get promoted,” Charles Duhigg tells CNBC Make It. Duhigg is the author of “Supercommunicators: How to Unlock the Secret Language of Connection” as well as two books on productivity and habit formation; he estimates he’s studied hundreds of people across his research for the three books.

“You could be the smartest engineer on Earth, you could be the most creative ad guy on the planet, but if you can’t communicate with your co-workers and your clients and your stakeholders, it’s going to be really hard for you to succeed,” he says.

Duhigg shared three things the best communicators do that others can learn from and adopt themselves.