Alexander's actions demonstrate what can be accomplished when a person is totally focused, when he or she has a magnificent obsession. His behaviour confirms yet again the importance for leaders of having a clear, well-defined vision; effective leaders must be able to clearly convey what the existing situation is and where they want people to be headed. Leaders have the responsibility to put proper mechanisms of organizational governance into place. Checks and balances are needed to prevent the abuse of power and faulty decision-making. Alexander knew how to encourage innovation. Because of his deft deployment of the phalanx, his support for and reliance on the creativity of his corps of engineers, and his own logistical acumen, his war machine was the most advanced of its time. Alexander was a praise-singer. He knew how to encourage his people for their excellence in battle in ways that encouraged further and greater excellence.