The Situational Leadership Model (SLM), also known as the Hersey-Blanchard Model, is a leadership theory that suggests that the most effective leadership style is one that is tailored to the maturity level of the followers. The theory was developed by Paul Hersey and Kenneth Blanchard in the 1960s and has since become one of the most popular and widely used leadership models in the world. The SLM identifies four leadership styles, each corresponding to a specific level of follower maturity: S1: