What’s the number one thing your company can do to attract the best and brightest up-and-coming talent? Provide them with opportunities to learn and grow.

But what about keeping them once they join your organization?

More and more, companies are discovering that an effective mentoring program is one of the most powerful ways to build loyalty. According to Deloitte’s 2016 Millennial Survey, millennial employees who intend to stay with their organization for more than five years are twice as likely to have a mentor (68%) than not (32%).

But it’s not as simple as setting up a mentoring program. Whether or not a mentor pair is successful is highly dependent on the effectiveness of the mentor-mentee match.

So, how do you make a good match?

What makes a good match? Whether you’re putting together a workplace mentoring program or just thinking about your prospects for Valentine’s Day, thinking preferences provide some clues.

On the work front, many organizations have begun setting up mentoring programs recently. With another estimated 4 million Baby Boomers expected to retire this year, these companies want to make sure their valuable knowledge, experience and critical thinking skills don’t leave along with them.

But just like any pair, not every mentor match is made to last.