[Functionalism is] a distinction between kinds of duties. - James D. Mooney

Although a separate function of some kind is implicit in the very existence of a separate department, there may be, especially in manufacturing procedure, certain general functions, appearing in some form of departments, which in turn may require organized supervision and correlation. Thus we have cross-functionalism.

Organization begins when people, even if they be only two or more, combine their efforts for a given purpose. We have shown this by the simple illustration of two people uniting their efforts to lift and move some weighty object. This combination, however, is not the first principle of organization. It is only an illustration of organization itself. To find the first principle, let us carry the illustration a step further. The efforts of these two lifters must be coordinated, which means that they must act together. If first one lifted, and then the other, there would be no unity of action, and hence no true organization of effort. Here then we find the first principles of organization.

In the practical sense the word principle may be applied to any underlying cause of more or less correlated facts in any particular field of investigation. The word principles, as applied to organization, is used by us strictly in the latter meaning.