Functional Size Measurement of Multi-Layer Object-Oriented - Conceptual Models

This paper builds on previous work showing a way to map the concepts used in object-oriented business domain modelling onto (a subset of) the concepts used by the COSMIC Full Function Points (COSMIC-FFP) functional size measurement method for modelling and sizing a software system from the point of view of its functional user requirements. In this paper we present a refined set of measurement rules resulting from a careful revision of our previous proposal, based on ‘field trials’ and feedback from function points experts. The main contribution of the paper is, however, an extended set of rules to be used when applying COSMIC-FFP to multi-layer conceptual models, including at least an enterprise layer and, on top of this, an information system services layer.