Psychologist Kurt Lewin developed his leadership styles framework in the 1930s, and it provided the foundation of many of the approaches that followed afterwards. He argued that there are three major leadership styles:
Autocratic leaders make decisions without consulting their team members, even if their input would be useful. This can be appropriate when you need to make decisions quickly, when there's no need for team input, and when team agreement isn't necessary for a successful outcome. However, this style can be demoralizing, and it can lead to high levels of absenteeism and staff turnover.
Democratic leaders make the final decisions, but they include team members in the decision-making process. They encourage creativity, and people are often highly engaged in projects and decisions. As a result, team members tend to have high job satisfaction and high productivity. This is not always an effective style to use, though, when you need to make a quick decision.
Laissez-faire leaders give their team members a lot of freedom in how they do their work, and how they set their deadlines. They provide support with resources and advice if needed, but otherwise they don't get involved. This autonomy can lead to high job satisfaction, but it can be damaging if team members don't manage their time well, or if they don't have the knowledge, skills, or self motivation to do their work effectively. (Laissez-faire leadership can also occur when managers don't have control over their work and their people.)
Lewin's framework is popular and useful, because it encourages managers to be less autocratic than they might instinctively be.
The Blake-Mouton Managerial Grid
The Blake-Mouton Managerial Grid was published in 1964, and it highlights the best leadership style to use, based on your concern for your people and your concern for production/tasks.
With a people-oriented leadership style, you focus on organizing, supporting, and