Information systems

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Information Information services Automated information coding Automated information processing Automated information retrieval Automated information storage Computer searching Databases Data collection Data processing Decision support systems Expert systems Human information storage Information dissemination Information literacy Information seeking Information specialists Information systems Information technology Information theory Intelligent agents Knowledge engineering Knowledge management Libraries Related topics Bioinformatics Censorship Communication Classification Concepts Declarative knowledge Electronic communication Internet Knowledge economy Messages Privileged communication Procedural knowledge Taxonomies

The term information system has the following meanings:

1. 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.

2. 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

Source: from Federal Standard 1037C and from MIL-STD-188 and from the National Information Systems Security Glossary

The simplest model that describes the Structure and Behaviour of an Information System takes five objects:

For Structure:

• Repositories, hold data permanent or temporarily, such as buffers, RAM, hard disks, cache, etc.
• Interfaces, exchange information with the non-digital world, such as keyboards, speakers, scanners, printers, etc.
• Channels, connect repositories, such as buses, cables, wireless links, etc. A Network is a set of logical or physical channels.

For Behaviour:

• Services; provide value to users or to other services via messages interchange.
• Messages; carries a meaning to users or services.

Source: from book "Seguridad de la Informacion", 2004 ISBN 84-933336-7-0

See also

• Information systems
• IPO Model
• Management Information Systems