La logique informatique
(selon les travaux de J.D WARNIER)
L.C.S organizing data in a computer system
Synthesis L.C.S
I hope to have succeeded through these few pages to arouse some interest in the approach of JD WARNIER concerning the data organization of a computer system.
This is not a training course, I recommend (if you wanted to go In more detail) either contact me, or obtain the complete book on this subject. (Editions d'organization)
I will simply summarize this approach with the following remarks:
2 °) Study of the activity of this company, study of the flows of production and financial. I recall the starting axiom, the computer system must be the image of the activity of the company.
One discovers the set B of the logical bases of the system..
1 °) Definition of the system (Enterprise) for which you wish to create your computer system. (the Repository)
3 °) Can be carried out in parallel with step 2, study of the requested outputs of the system, and obtaining the primary data to be stored in the system
4°) Subdivision of the bases concerned by the S-Ds studied
5 °) Study of belonging of the primary data <---> F.L.P
6 °) Study of Logical Operational Files
And you get the database you relish !
My last remarks, (To be read imperatively until the end ...)
This study, like L.D.R, is based on the analytical approach which consists in starting from the whole to go to detail and not the reverse as many other "methods".
The mathematical rules used are simple and unequivocal (which is not the case in other "methods")
- Any collection of data must be considered as a set in the mathematical sense of the term and therefore defined by understanding.
- We must know the relations that exist between all the sets of a system.
- Any correspondence between two sets must be an application in the mathematical sense of the term.
And one last thing. This L.C.S study, conceived in the 1970s by J. D WARNIER, was carried out without taking the time (it was urgent at that time) to study profoundly the organization of companies.
It is for this reason that 20 years later, the book on the organization of companies which ( I can now reveal to you ) is challenging the first part of the book L.C.S that I have just developed with you !!!!!
Do not be angry with me ! But it was impossible for me to ignore this step you will see why after !, and rest assured, go and see LCO. I am sure you will pardon me !