In 1999, the grid managerial seminar began using a new text, The Power to Change. The theory was updated with two additional leadership styles and with a new element, resilience.
The grid theory has continued to evolve and develop. The optimal leadership style in this model is based on Theory Y. This model originally identified five different leadership styles based on the concern for people and the concern for production.
The managerial grid model or managerial grid theory (1964) is a style leadership model developed by Robert R.
