文档介绍：STEPS TOWARD MODEL UNIFICATION FOR
SOFTWARE, SYSTEMS ENGINEERING, AND
SYSTEMS OF SYSTEMS
Ricardo Valerdi and Jo Ann Lane
University of Southern California Center for Software Engineering
941 W. 37th Place, SAL Room 330
Los Angeles, CA 90089-0781
(******@ & ******@)
1. Introduction
plexity of large-scale systems requires cost estimation models that can capture plexity of the job required to develop them. Many useful models have been developed to estimate software development effort. A recent need to estimate large scale efforts such as the Army’s bat System – a system-of-systems (SoS) – has called for the development of a model that can characterize the effort required to integrate large software systems into a cohesive system. Other efforts to develop a model for systems engineering effort estimation have been supported by International Council of System Engineering (INCOSE) and the Center for Software Engineering (CSE) corporate affiliates. Both efforts are leveraging off the popularity of the O II model and applying its best practices.
The existence of these three categories of models (for software development, systems engineering, and system-of-systems) has created the need for a clear definition of the scope of the models and their interrelationships and overlaps. Currently, estimates for software development can be performed using the Constructive Cost Model (O II). In the future, estimates for systems engineering will be done with the Constructive Systems Engineering Cost Model (COSYSMO), and system-of-systems architecture definition and integration estimation will be done with the Constructive System-of-Systems Integration Cost Model (COSOSIMO). plications can arise when any two of these models are used in parallel since each of the models was initially developed as an independent entity. Moreover, there is a need to integrate multiple models to prehensive estimates of large-scale development efforts, which may involve soft