A System modeler enables you to develop a decomposition structure based on your system object types. This is a network of automated components which work together to provide functionality that satisfies specific requirements. A system designed to support functional business requirements is frequently refered to as an application system.
A system can be viewed as software that consists of a coordinated set of distinct (as seen from other users perspectives) functions. Accordingly, a system can range from a massive network supporting multiple organizations to a system that is a functional part of another system. This later type of system is commonly called a subsystem.