Or, you could just have good managers who listen. Employees will usually tell you.

There's a fine line between being proactive and being intrusive.

Credit Suisse also used analytics to investigate why women with certain job titles left the company at higher rates than men, and determined that transitions—whether a promotion or a personal milestone, such as a maternity leave—increased the probability of a woman deciding to leave.

To kindle closeness among team members, and help forestall attrition, Box has encouraged managers to throw more social events, recognize team-based work and hold more mentoring meetings between senior leaders and newer employees. Since workers were more likely to leave if they didn’t see clear career opportunities at the company, it has sought to improve at pointing out career possibilities for individual workers and encouraging “stretch” assignments.