Management can be described as "getting things done through people". This means that there must be a manager to control and motivate these people or human resources. While there are many different styles of managers and management techniques, management theories are the most important. Management theories describe some behaviors renowned for achieving company objectives. The four main management theories are classical-scientific, behavioral, political and contingency. These all have different styles and outcomes and have many similarities and differences when put into practice in a business environment. Classical scientific theories of management developed between the end of the 19th and the beginning of the 20th century. Most of the workforce was inexperienced and ignorant, so they had little management experience. Democracy was not yet fully developed and as a result most owners and managers ruled with an “iron hand” and rarely consulted employees. However, from these roots sprouted many different management techniques and styles that would form the basis of management today. These include the hierarchical structure of the organization, the division of labor, and autocratic and authoritarian management styles. The hierarchical structure of the organization is the traditional form of organizing a business. This can best be visualized in a pyramid shape, with the owner, CEO or board of directors at the top. This higher level of management deals with planning, organization and control. They are usually required to develop long- and short-term strategic plans to achieve company goals. They are also responsible for any changes made to the business, such as a change in the Prime Feature or the introduction of a new product line. The second phase is Middle Management which coordinates the activities of the supervisors. Prepares policies and plans and is responsible for its budgets and the appointment of new employees. At the third level of the structure are the supervisors who have the power of concurrent control. They are the link between workers and the highest level of management. They are chosen for their technical skills and ability to motivate others. An important management tool developed from this period is called Division of Labor and can be found in many workplaces today. The idea behind division of labor is to break complex tasks into many simpler tasks and assign a different person to each task.