By Bourbaki N.

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**Additional info for Seminaire Bourbaki, 33, 1990-1991 - Exp.730-744**

**Example text**

This is provided in the discussions that follow. 4. 4 does not include a preliminary phase during which solution alternatives for the problem are explored and a decision is made to adopt a modelling and simulation approach. We note that the option of also carrying out other complementary approaches is entirely reasonable and is often prudent for some portions of the problem. 4 its existence and importance must nevertheless be recognised. It should be emphasised that a modelling and simulation project of even modest size is often carried out by a team of professionals where each member of the team typically contributes some special expertise.

There is a variety of formalisms that can be effectively used in the refinement process. , Petri nets, finite state machines), rulebased formalisms, structured pseudocode, and combinations of these. The choice depends on suitability for providing clarification and/or precision. The result of this refinement process is called the conceptual model for the modelling and simulation project. The conceptual model may, in reality, be a collection of partial models each capturing some specific aspect of the SUI’s behaviour.

In such situations, it is possible to infer the values of one or more variables within this set from the values of other variables. Achievement of enhanced clarity is usually the motivation for allowing such redundancy. A second reason why the set of state variables of a dynamic model is very special is that this collection of variables completely captures the effects of ‘past’ behaviour insofar as it affects future behaviour (both observed and unobserved, that is, from the perspective of model output).