[Excerpt] Great leadership makes employees devote more energy to their job and yield good performances. Since leadership is vital to managing an organization, all organizations always need to assess how well leaders exercise that leadership over their subordinates. However, assessing leadership effectiveness is often a difficult exercise for many organizations, because of potential backlash from giving negative feedback to leaders. In addition, most assessment procedures are not based on standards and the items on which a leader is assessed are undefined or poorly defined. There is no perfect instrument for assessment. So, we will focus on how best to assess leadership effectiveness by using current assessment instruments wisely.