As a coach for product leads, I've noticed an interesting phenomenon: Some of my coachees make much more progress than others. And as a naturally curious person (and someone who’s invested in my coachees’ success), I started trying to get to the bottom of this. Why do some people make progress in leaps and strides while others only improve gradually? I’ve come to the conclusion that while there are several key personality traits that can help someone become a great product manager—emotional intelligence, adaptability, and intellectual horsepower—there's another skill that's often overlooked: cross-disciplinary learning.