Leadership, Management, Supervision
Leadership can be described as the ability to cast a vision and pass that vision on to others in an effort to accomplish it together. It involves the capacity for conceiving a plan, as well as some idea of how that plan will be manifested. A leader possesses the capacity for making his dream "contagious," or at least can inspire people to be willing to "do what they don't want to do."
Management pertains to the implementation of a pre-conceived plan. It addresses the more mundane particulars of logistics, supplies, availability of personnel or workforce, etc. A manager has some idea of who his staff are and what skills or talents they possess, but is primarily concerned with the broader picture in making the plan come to fruition.
Supervision, the most mundane of leadership qualities, pertains to the observation by a superior to the staff and resources under him. It is primarily concerned with actually delegating, or matching up the individual staff member, employee, or volunteer with the task to which they are either best suited, or any task for which that supervisor needs a worker. The supervisor is charged with most basic level of realizing the plan cast by upper leadership.
These three concepts are typically, but not necessarily, performed by individual persons or management teams, though they may also actually be performed by a single person, especially in small organizations. The leader will "concoct" the goal and some general procedure for how to attain it. Management will then concern itself with more specific issues such as application and nature and quality of the delivery of the product or service. Supervisors deal with watching the finest process of the goal, often without a real idea of the "big picture," and making sure the work done under their watch is adequate as determined by superior levels of the organization.