Modeling data consists of identifying management objects (entities) and the associations or relationships between these objects, considered significant for representation of company activity.

The entities, associations and properties that constitute the data model associated with a sector of the company must be sufficient to provide a complete semantic description.

In other words, one should be able to describe the activity of a company by using only the entities, associations and properties that have been selected.

This does not mean that there will be a direct equivalent in the data model for each word or verb in the explanation. It means one must be able to state what is to be expressed, using these entities, associations and properties.