One attribute that is at the heart of all leadership decisions, and often acquired through that which can be learned from our mistakes, is the ability to exercise good judgement. This is usually taken as a person's capacity to make decisions based on their knowledge, qualifications, personal skills and intuition.
More than anything else it is this aspect of leadership that requires experience and maturity. Judgement is, in many ways, the hardest disposition of leadership to master precisely beacuse of its intangible nature. Essentially, judgement could be considered as taking all the facts at the leader's disposal, then using their expertise to fill in the blanks and hence deciding whether the intended course of action is prident and reasonable rather than negligent.