A feral information system is part of an information system developed by individuals and groups to help with day-to-day activities that is not condoned by management.  It is called feral because it circumvents existing information technology systems or works around key system architecture .  It is important to note that the information is a part of the experience of performing work duties.
A feral information system can be written for a variety of reasons. The general reason given is that they are ways of working around the existing management information in order to support day-to-day work.  Feral information systems are sometimes referred to as shadow systems .
Reasons for feral information systems
Reasons for making information systems include: poor training practices in IT firms, inadequate systems, complex political relationships and a host of related issues.  Recent research has linked feral information systems to poor operational planning . 
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- Jump up^ Thatte, S. and Grainger, N. (2010). Feral Systems: Why Users Write Them and How They Add Value 5th Pre-ICIS Workshop on ES Research, St. Louis, USA.
- Jump up^ Kerr, DV, and Houghton, L. (2010). Just in time or Just in case: A Case study on the impact of context in ERP implementations. Australasian Journal of Information Systems, 16 (2): 5-16.