Abstract: A method for determining the complexity of an enterprise information resource management system, the enterprise information resource management system being used to contain an ontology into which a plurality of enterprise data assets are mapped, the ontology including a plurality of model constructs, the enterprise data assets including a plurality of assets constructs, and the mappings between the data assets and the ontology including a plurality of mapping constructs, including receiving (i) a number of distinct asset constructs, denoted by CASSET, (ii) a number of distinct mapping constructs, denoted by CMAPPING, and (iii) a number of distinct model constructs, denoted by CMODEL, evaluating a metric of complexity, denoted by M, for an enterprise information resource management system having a capacity corresponding to CASSET, CMAPPING and CMODEL, according to a formula M=ƒ(CASSET, CMAPPING, CMODEL, X), where ƒ is a real-valued function of three or more real-valued parameters and X denotes optional additi