1. An information system combines information technology, people and data to support business requirements. The five key components are hardware, software, data, processes and people .
2. A system, whether automated or manual, that comprises people, machines, and/or methods organized to collect, process, transmit, and disseminate data that represent user information.
3. Any telecommunications and/or computer related equipment or interconnected system or subsystems of equipment that is used in the acquisition, storage, manipulation, management, movement, control, display, switching, interchange, transmission, or reception of voice and/or data, and includes software, firmware, and hardware.
4. The entire infrastructure, organization, personnel, and components for the collection, processing, storage, transmission, display, dissemination, and disposition of information. [INFOSEC-99] [ Available at: http://www.atis.org/tg2k/_information_system.html ]
5. The most important part of an information system is the people . The hardware, software, data and processes are all secondary items that together, facilitate the effective manipulation of information.
An information system is really about people and information not computers
A computer, a telephone, a fax machine, a television - think of any machine and you will realise that it is pretty useless without people around to use it. That is why we are all referred to in the information systems world as " users ".
The organization between the parts of a system to reach their common goal is achieved through extensive communication . You could say that it was achieved through a communication system - maybe even an "information system"
A systems analyst must understand the company’s organizational model in order to recognize who is responsible for specific processes and decisions and to be aware of what information is required by whom