IRIS has been rolled out across 1,000 users in the MoD and includes an information capture tool, a workflow tool and a management reporting tool.
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IRIS will also be used to improve the processing of health and safety claims.
Richard Hatfield, the MoD's director of personnel, said the MoD project team and the prime IT services contractor Logica had delivered IRIS on time, within budget and to specification.
IRIS is based on software from Norwegian supplier Omniware, which was implemented by Logica, which will continue to support and maintain the system under a 10-year service contract worth £5m.
Logica is also implementing the MoD's defence medical information capability programme (DMICP) to make military medical records accessible to authorised users across the UK, overseas and on the battlefield.
The DMICP is scheduled to be rolled out to all UK Army medical facilities, RAF, Royal Navy, Defence Dental Services and permanent overseas bases by August 2008.