Any group possessing common goals is an organization. But business organizations can be classified according to the nature of their internal authority relationships. Although there are five forms of organization structure, four forms are common: line, line and staff, committee, and matrix. The line structure is the oldest form and is frequently used today in smaller organizations. The functional form uses specialist managers entirely responsible for their own fields within the operation. The line and staff form uses specialists to assist line officers. This is commonly used in medium and large size firm. The fourth and fifth types, committees and the matrix organizations exist in many firms but only ready as the sole types. They are typically used as a sub-organizational form within a line and staff structure.
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