The tentative thesis of the Enterprise Resource Control (ERC) theory is the statement, that every planning and control system, taken from any enterprise, may be transformed with all its functions and data to an ERC system or to its part. In spite of such declared generality of the ERC theory the structure of the framework ERC system is relatively simple. All information describing organizational and functional structure of an ERC system, the structure of its data, as well as data values may be recorded in the relational database of this system. The key attributes of all tables belonging to any ERC system may be taken from the settled set of 20 structural attributes. The framework ERC system may have any number of organizational levels (typically four: primary organizational system, a plant, an organizational cell and a workstation). In each level, except of the lowest one, there are four functional layers of coordination, reengineering, allocation and execution planning. For formal description of ERC systems the Organizational Information-Transition Nets (OITN) are applied. The OITN structure is similar to the structure of Coloured Petri Nets (CPN). Pages from a hierarchical CPN correspond to organizational systems belonging to a multilevel OITN. OITN transitions are sites of data processing procedures. OITN places, incident to a given transition, are the sets of those tuples from the database tables, which are data inputs or data outputs of this transition.
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