The four theory of leadership was formulated after studying hundreds of leaders and the model includes four basic dimensions of effective leadership - support; interaction; facilitation; goal emphasis, and work facilitation. This model was tested as a predictor of an organization's effectiveness.
The Hersey and Blanchard Situational Theory model suggests that a leader must adapt his leadership style based on task and relationship behaviors appropriate to the situation. Leadership style is dependent on the maturity level and abilities of followers. Under this model, successful leadership is both task-relevant and relationship-relevant.
Functional leadership theory addresses specific leader behaviors that are expected to contribute most to the organizational effectiveness by focusing on how the leadership process occurs. The leader should ensure that all needs of the group get addressed.
Idiosyncrasy Credit Model of Leadership builds upon the awareness that when the emergent leader meets the team's expectations, idiosyncrasy credits are awarded. These credits depend on how the leader fulfilled follower's expectations and what is the impact of the leader's decisions on the follower. When the balance of credits shifts, another leader will emerge.
In the field of communication studies, there are numerous models. No one model is suitable for all purposes and all levels of analysis. Some common models are known as Lasswell Model, George Gerbner Model, David Berlo Model, Shanon and Weaver Model, Osgoods Model, and Schramm Model. All these describe the four components of the communication process, namely, the source (communicator), the message, the channel, the receiver (audience).
Charismatic leadership is a trait-based leadership theory where the leaders act as visionary driven by their convictions and motivate their followers to work towards common vision using their charm and persuasiveness. These charismatic leaders act as role models and exhibit extraordinary characteristics that inspire devotion and motivation in followers to persuade change. Leaders are able to cultivate a profound sense of trust with the group of followers.
Self-Fulfilling Prophecy (SFP) Leader Theory
Pygmalion theory of Leadership is a model of SFP at work involving supervisory expectancy based on the pygmalion effect. This effect is a type of self-fulfilling prophecy (SFP) in which raising leader's expectations regarding subordinate performance boosts the group's performance. Managers who are led to demand more from their team, lead the team to better performance. There is some evidence that the SFP effect does exists.
Rensis Likert studied the patterns and styles of managers and developed four management systems known as Likert's management systems. These styles developed by him are known as Likert management systems. System 1 - Exploitative Authoritative; System 2 - Benevolent Authoritative; System 3 - Consultative and System 4 - Participative.
Contingency Theories of Leadership
Contingency theories of leadership focus on both the leader's persona as well as the situation/environment in which that leader operates. These theories consider the context of leadership which means whether or not the leadership style suits a particular situation and states that a leader can be effective in one circumstance and a failure in another one. A leader will be most effective when he applies the right leadership style to a given situation and environment around him. Contingent leaders are flexible and adaptable.
Socio-technical theory of leadership focus on the presence of two subsystems in every organization, the interrelatedness of social and technical aspects of an organization. Theory pertains to the social aspects of people and technical aspects of an organization, which means structure and processes within the organization.
Theory Z also called the "Japanese Management" style is a leadership theory of human motivation focused on organizational behavior, communication, and development. It assumes that employees want to enter into long term partnerships with their employers and peers. Offering stable jobs with an associated focus on the well-being of employees results in increased employee loyalty to the company.
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