Planning may be divided into two categories: sectorial planning and regional planning. Sectorial planning is concerned with the development of a single industry or group of related industries. It aims to achieve maximum production with minimum expenditure. Sector plans are usually prepared by senior officials within an organization who are not involved in day-to-day management tasks. Regional planning involves consideration of resources across several sectors, especially primary industries like mining and oil. Its aim is to ensure that development occurs where there are sufficient resources to sustain future needs. Regional planners may work at local, state, or federal levels. They often draw on information from many different sources to make recommendations regarding the future location of industries and people.