Even though the ERP is a concept increasingly knownto many administrations and companies, that does notmean that its implementation could be carried out swiftly.All the organization is concerned and a good preparationis essential.Its implementation must be narrowly followed, during thephases of analysis and installation, as well as production.

Even if computer science presents a popularised ideanowadays, we should notice that industrial data processing is far from office automation and thateach component represents an essential link ofthe global performance.

No element must be disregarded :
The expectations of the various departments of the company,
The precise expression of the company's needs,
The socio-cultural factors,
The acceptance of changes...