Abstract: The invention is a method of determining the contents of a selected data field. The steps begin by attaching, from an application program, a database to be mapped. Once the database is attached, a field identification module (FIM), will scan the contents of the database to determine a data field identifier for each of the data fields to be worked upon. The FIM will then compare each of the data field identifiers with a list of known identifiers stored in a repository and assess a first score in respect of the comparison wherein the score is representative of a probability that the comparison is an accurate comparison. When a first probability score has been determined, the FIM will sample the data field according to a pre-selected list of requirements and make a second comparison with the data field. The FIM will then assess a second score.