Hello. Yesterday I modified the article data model but can not modify it. In particular, with respect to the classification by the model data page reads: In addition to the classification for the role of databases, they can also be classified according to their data management model. The data model has little to do with how they manage data and has more to do with representing the data in the base. A data model is basically a "description" of something known as a container of data (where something is stored information) as well as methods for storing and retrieving information from these containers. This is quite far from what is considered a model of data in the subject area database in particular, left out models such as Entity-Relationship .. since they do not care at all about how to retrieve information. Data models are not physical things: they are abstractions that allow the implementation of an efficient database; usually refer to algorithms, concepts and models that facilitate matemáticos.son the work of a company administrator. I agree with one part: they are abstractions .... but I do not agree to take that view, by itself, with the efficiency of the base. Again, the entity-relationship model is counter to this. No worries at all (and should not worry) for efficiency. In sorting the data model, it is not relevant because it is not suitable for databases, but is more suitable for DBMS's