Abstract: A source data field is transformed into a destination data field. A map defining the transformation is implemented by a user interface. The user interface allows the user to identify and select one or more source data fields and to transform the source data fields into selected destination data fields unit using simple programming language instructions, such as XML. In addition, the user interface provides a dialog that allows the user to incorporate one or more formulas into the transformation map. The maps may be saved individually or as a project including multiple maps.