Maslow developed a hierarchy of needs. Herzberg focused on improving job satisfaction. McClelland theorized about life experience and its role in the workplace. McGregor and Ouchi have developed a series of theories that accurately describe multiple management styles. Thamhain and Wilemon helped define methods that managers could use to increase employee job satisfaction. Covey defined the key habits that should be used to be successful. Lencioni explored the reasons why organizations so often fail and the methods that could be employed to prevent this from happening. While project management still remains an ongoing science, these people have helped provide a solid foundation for years to come, for those involved in managing people and for those studying and hoping to one day be in a position of leadership.