The primary aim of this study was to validate the four leadership styles of the Leadership Judgement Indicator (LJI). The LJI is a Situational Judgement Test, which measures the quality of leadership judgment and the preferred leadership style of a manager. The instrument for validation is the assessment of the manager by their subordinates concerning the four leadership styles. Secondly, the relations between the four leadership styles and the managers effectiveness, flexibility, ability to motivate subordinates and subordinates satisfaction were tested. In addition, the relations between the four leadership styles and situational and sociodemographical characteristics such as birth order were analyzed. For statistical computation of the hypotheses and research questions correlations were used, except of testing separated by gender, t-tests were applied. Participants (N=224) were separated in managers (n=54), who completed the LJI and employees (n=170), who assessed their managers. There was no significant correlation between the preference for one leadership style and the quality of leadership judgement of the LJI and the four leadership styles assessed by the employees. Managers, who have more managerial experience (r=.514, p<.01) and managers, who work in a hospital (r=-.298, p<.05) prefer the consensual leadership style. The preference for a delegative leadership style of a manager is related to a lower level of education (r=-.314, p<.05). First born managers are better in judging the general appropriateness of a leadership style (r=-.316, p<.05). The higher the managers level of education, the better he/she knows to judge the general appropriateness of a leadership style (r=.355, p<.01).