Working with domain entities
System
A system is a set of IT resources that includes hardware, software, middleware, utilities, applications, and operating systems. A system can refer to a physical computer, or a logical component on a computer. For example, a software resource such as a database can be considered a system.
Business driver
A business driver represents the load processed by an application, and is a consequence of the application's business purpose. For example, a bank's website can be characterized by the number of pages accessed by the users and by the number of web banking transactions. Business drivers represent the users' behavior, and selecting the most appropriate business drivers is key to the capacity planning process. In comparison, systems represent the IT infrastructure's point of view, while business drivers represent the users' point of view.