The Information System Service Layer

One of the main goals of building enterprise information system is to satisfy the information needs of the different stakeholders of the organisation. But before information needs can be satisfied, information obviously needs to be registered first. As a consequence, an enterprise information system needs to offer two types of services: input services to register information and output services to satisfy information needs. In combination with the enterprise layer, this leads to three loosely coupled subsystems, each addressing a specific concern: