I submit that leadership is the formation of a vision and persuading other people to adopt it. From this standpoint, leadership is distinct from management—the latter taking the vision as a given and going from there to formulate strategy and implement it as policies. In short, a vision is open to leaders to change but closed to managers, who must take a vision as a given.
Regarding a leader’s vision, I contend that it contains meaning and values held together in a social reality; hence the breadth of a vision. Two scholars insist that a leader works to shape and interpret situations out of what has previously remained implicit or unsaid, guiding by common interpretation of reality via vision through foresight, hindsight, a world view, depth perception, peripheral vision, and revision. The social reality in a vision is thus deep as well as broad, reaching even the subconscious level of the human mind. To the extent people have bought into the leader's social reality, the leader has led.
The full essay is at "Meaning and Value of Leadership"