1. A method comprising: using a server computer, creating and storing a first module name, a first indication of a first version, and a first signature for a first data model that is digitally stored in a digital electronic data storage unit; using the server computer, receiving a second data model from the data storage unit and identifying a second module name in the second data model; using the server computer, comparing the second module name of the second data model to the first module name of the first data model; determining that the first module name and the second module name comprise a same name, and in response thereto, identifying a second indication of a second version from a revision field of the second data model; using the server computer, comparing the second indication of the second version from the second data model to the first indication of the first version of the first data model; determining the first indication and the second indication indicate the same version, determining a second signature for the second data model; using the server computer, comparing the second signature for the second data model with the first signature for the first data model; determining from the comparison that the second signature and the first signature are different, and in response thereto, creating and storing a flag value in main memory of the server computer and specifying that the second data model is different.