A great coach must possess keen powers of logical thinking and problem-solving. These attributes allow a coach to creatively solve any problem that arises on or off the field. These qualifications include patience, respect for others, respect from others, understanding, ability to relate, common sense, and consistency. A team without discipline is without structure. A team with too much discipline is without heart.
Balance is the key.
All players must obey the same rules, all players must be judged equally. No player is irreplaceable. Be fair, and be consistent. The coach must be able to make adjustments to capitalize on the opponent's weakness. If something isn't working, the coach must be able to identify and correct the problem.