the data structure set were similar and "congruent" ways of structuring data while working for Honeywell. The entity–relationship model was first proposed in its current form by Peter Chen in 1976 while he was conducting research at MIT. This model became the most frequently used model to describe relational databases. Chen was able to propose a model that was superior to the navigational model and was more applicable to the "real world" than the relational model proposed by Codd. See also Database replication References Data management Servers (computing)