You make decisions everyday irrespective of your position, type of work, experience and intellect. The end result is directly impacted by the quality of your decision. Hence it can be said that decision making is one of the important competence that you posses and would like to improve upon.
Some decisions are of great importance and some are not so important but the underlying skills are the same so where is the difference? Difference is in the intensity and range of the decision making process that leads to the decision.