The degree to which the leader achieves the set goals of the group or organization, while maintaining a balance between organizational effectiveness and participant satisfaction. Leadership effectiveness reflects a leader’s ability to lead people, make informed decisions, motivate the team, and foster collaboration among participants in a way that effectively and sustainably achieves desired outcomes. From a psychological point of view, the effectiveness of a leader is determined by his ability to deeply understand people’s motivations and needs, manage emotions and behavior, and build trust and authority. An effective leader has communication, motivation, problem-solving, and strategic decision-making skills that allow them to guide members toward optimal performance and strengthen their sense of belonging and responsibility for achieving the group’s goals. From a social and organizational point of view, the effectiveness of a leader also includes his ability to balance the achievement of the practical goals of the group with the maintenance of positive human relations between the participants. An effective leader not only focuses on tangible results, but also strives to develop commitment, participation, and overall satisfaction within the group, ensuring sustainable performance and long-term operational success.