You might think your employees are happy, but a 2015 survey done by recruiting software provider Jobvite found that almost half of all employees—including the satisfied ones—are open to leaving.

"Today’s employee is antsy," says Jobvite CEO Dan Finnigan. "The post-WWII phenomenon of people working at large companies for their lifetime was a blip in history. Millennials, for example, are expected to hold 15 to 20 jobs over the course of their careers. And for all age groups, moving up usually means moving on."