In a shell, a IT system is a set of connected elements, and its task is to method the entered information exploitation engineering. Info systems contains the following components: element - is that the basic element of the system, devices accustomed store knowledge, communication between individual elements in the system, devices that facilitate in communication between a computer and somebody's, to receive data from outside - e.g. scanners, cameras, electronic sensors, executive elements, external controls employed by the pc, processing devices, software, i.e. Operational systems that management data technology, human resources, i.e. employees operative computers and individual parts, and organizational components, i.e. structure and knowledge elements, or the mental object - ticket scanners. Exemplary sorts of IT systems supporting enterprises are gait - Business process Management, CRM - customer Relationship Management, MRP - Material necessities designing, SCM - supply Chain Management, ERP - Enterprise Relationship Management, ERM - Enterprise Resource designing. IT systems are often simple, however conjointly terribly difficult, such as banking systems, field management systems, railway systems.