Understanding how people behave is one thing. Developing who they become as leaders moves beyond that. This is where the classical framework of the four temperaments—Choleric, Melancholic, Sanguine, and Phlegmatic—reintroduced in modern leadership thinking by Alex Havard, provides a fundamentally different lens. It begins with behavior, but it does not stop there. It moves into formation—into the disciplined development of leadership character. And that distinction is where the real opportunity lies.