La logique informatique
(selon les travaux de J.D WARNIER)
L.C.O The organization of companies
The steps :
We discussed the stages as soon as presentation of the production flows related to the main activity of the company, showing its relations with the outside world.
A step is composed by the relationship between a set of customers (a set that can contain only one element) and one or more sets of suppliers, it based on the products of the catalog ordered by customers and delivered to customers.
Please note that it is to define precisely the set of responsibilities devolved to each section of the company.
Here is the diagram of a step with a single supplier :
Purchasing section place orders to external suppliers but it's not recipients of deliveries. It should be noted that all orders to external suppliers go through the purchasing section irrespective of the category of products. We agree that there is no need to distinguish in this stage the different categories of products since there is only one flow.
Let us now examine the cases of a client section concerned by several product flows, and which is in relation with several sections of suppliers.
Here is the diagram of a step to several suppliers :
Remember, the store orders, to purchasing section its supply for two categories of products:
- Parts intended for the manufacture,
- Spare parts necessary for the maintenance of products manufactured in the company.
The store orders, to shipping section, the delivery of the spare parts for the agencies.
Finally, the store receives delivery of spare parts sent to it by external suppliers.
You will have noticed yourself that, since a step is defined by a client section and only one (or by a set of external clients), the number of steps to be studied for a given system is equal to the number of system sections plus the number of external client sets.
Having arrived at this level of the L.C.O study, we studied, organized, and defined perfectly all the production flows of our company, and thus specified the rules of management on a number of essential points.
If we take as the starting axiom that: "the computer system must be the image of the activity of the company", then we can start now to talk about sets of data.
This is what we will now discuss :