Decisiveness is demonstrated by studying different choices and then selecting the best one. It is also knowing when NOT to make a decision. Get the facts, all of them. Make your decision once you have considered all of your options. Then issue your decision in clear, confident terms. Don't haggle over minor points. Don't confuse the people you are dealing with by debating with yourself out loud. Say what you mean and mean what you say. Make up your mind in time to prevent the problem from becoming bigger.

If a decision is beyond the scope of your authority, take the problem up the chain of command to the person who has the job to make that decision. But if the decision is yours, make it. Don't pass the buck. Also, not making a decision is a decision.