Labor and management are considered basic elements in cyclic conflict. A model is developed assuming that their interactions arise solely from the sustenance needs of the elements. The “size”; and “state”; determining the condition of the elements are defined. Analysis of the interactive industrial forces yield the governing differential equations of the industrial system. The industrial system is assumed to be sufficiently large so that individual psychological effects are averaged out and may be neglected. The industrial change, industrial change rate, industrial energy, industrial power and industrial stress are defined.