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Annals of Systems Research: Publikatie van de Systeemgroep by S. Cohen (auth.), B. van Rootselaar (eds.)

By S. Cohen (auth.), B. van Rootselaar (eds.)

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Additional info for Annals of Systems Research: Publikatie van de Systeemgroep Nederland Publication of the Netherlands Society for Systems Research

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1. Introduction A possible way of looking at a system is to consider it a composition of three types of structure: a LOGICAL (LS) relating to what is or has to be done, an ORGANIZATIONAL (OS) relating to how things can be done, and a PHYSICAL (PS) relating to the tools which can be used. This classification can best be explained with the aid of examples: In a company, the familiar diagram (board of directors, president, vicepresident, manager, worker) together with the rules (who can give direct orders to whom) and the statutes represent the OS, the functional division of that company into, for instance, marketing, finance, planning departments, forms the LS and the employees form the PS.

To check the uniprocedurality in x of the activity, the respective managers were asked if they could produce (x), given P;' as input, (this, as wehave seen, is the uniprocedurality criterion). Their answers are recorderd in table 1. e. e. orders that can be fulfilled) which of these orders are credit orders and which are cash orders. This information can be derived from either e 1 , e2 , or e,: thus FA has more than one procedure to product (eIO), as already indicated by the uniprocedurality criterion.

To _ :lI . ,. \ .. · ·. ·.. I'lt'L ' O\ - . ll' ::l"l;l ' ~ , ,,, I I · ... ,. ,,, . U '" · t, ,,, on .. ' " ft, . "C " .. " ,o ';"" " '11'0 ~ '. 5 the fluid coupling switches and the pump starts to rotate (OMEGA 3). 5 feed water starts to flow again (PHI). 32 J. J. V AN DIXHOORN Using simple algorithms the network graph or bond graph of the example can be converted to a block diagram, as shown on page 28. Signals for across-variables (a, p) and through-variables (M, q,) are drawn on different levels.

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