The routing and cost of the information flow in a system

A study of information flows in different types of procedures used for the management of the agricultural credit in the Agricultural Bank of Greece is discussed in this paper. Systems and subsystems are structured using new diagrammatical notation in order to identify explicitly the system. The communication network of the information flow with certain nodes (individuals) and types of links (types of communication) is also considered. In addition to the normal link cost of such diagrams, a node cost, which depends on the types of links involved in the network, is included. An optimal routing from a given node to its destination node can thus be sought. The conditions of stability and change of the system are examined from the information flow cost point of view through the procedures associated with short-term agricultural loans.