n. mental calmness, composure, and evenness of temper, especially in difficult situations

Remaining calm when your world is being rumpled into a worthless ball of paper is extremely difficult. In fact, it feels impossible. However, it is the best possible way to attack a problematic challenge. Facing a situation with a state of an even mental composure, forces you to think about all the possible options available to you, in order for you to pick the best one. While, if you lose your calm it causes you to make a frantic, usually ineffective solution.