Logica plc was a multinational IT and management consultancy company headquartered in London and later Reading, United Kingdom.

Founded in 1969, the company had offices in London and in a number of major cities across England, Wales and Scotland, as well as in other countries around the world.

The company's main business at that point was in providing consulting, systems integration, and IT outsourcing in both the public and private sectors.

[4] Its founders were five people who left Scicon, an American computer company that had opened a London-based UK subsidiary and that had then been bought by BP.

[7] Logica had a major success that gave it visibility when it won the design of the SWIFT network for international money transfers in 1972–73.

[4] The company's staffing levels were around 200 employees in the early years, and their successes at pulling off large-scale and difficult projects garnered them a reputation for technical excellence and able management.

The project, with the support of partners throughout Europe and the assistance of Bolt, Beranek and Newman in Cambridge, Massachusetts, used the packet switching technology of the NPL network and ARPANET and X.25 protocols to form virtual circuits.

[17] With the support of the UK's National Enterprise Board, in January 1979 the company established a new subsidiary to exploit this technology, Logica VTS.

[24] Logica Rapport was an early relational database management system that was developed internally in 1977 and began selling as a general product in 1979, with another release in 1980.

[24] This Logica group put out several releases, including Xenix 3.0 in 1984, which was based on UNIX System III for 16-bit processors with some Berkeley Software Distribution networking functionality and improved compatibility with MS-DOS.

[24] Logica stated that it had over 300 clients for its Xenix product, including other computer manufacturers such as Acorn Computers, Plessey Microsystems, SAGEM, Regnecentralen, and Triumph-Adler, indirect sales through resellers, and direct sales to end customers such as Chemical Bank, West Midlands County Council, and Natural Environment Research Council.

[6] In 1985 they were faced with a hostile takeover bid by the Ross Perot-led competitor Electronic Data Systems (EDS), but they were able to fend it off.

[36] Logica set up joint ventures in Hong Kong with Jardine Matheson to undertake the real time trading system for the new integrated Hong Kong Stock Exchange in 1984, in Italy with Finsiel in 1993,[38] and in the UK with British Airways in 1990 to undertake the development of computer systems for the airline and then sell them to other airlines.

[41] During this period the company's turnover fell flat, and it suffered a loss in 1991, as it struggled with the effects of the early 1990s recession, especially among customers in the financial services industry.

[5] The company gained a reputation for emphasizing the creation of technically difficult, bespoke solutions, but ones that did not always maximise customer or shareholder value.

[8] Most of the executive directors left the company during the two years following his appointment – David Mann, Colin Rowland, Andrew Karney, Ian Macleod and Cliff Preddy.

[8] Its customers included large governmental organizations and private companies such as Ford, Exxon, IBM, Compaq, Vodafone, Reuters, Merrill Lynch, Prudential, Deutsche Bank, and Diageo.

[8] In 1999 the buyout of the in-house Customer Care and Billing product division took place leading to the founding of the company that would become Cerillion.

[45] In 2001 the company secured an outsourcing contract to create and operate a new case management system for the Crown Prosecution Service.

[51] On 20 February 2007, LogicaCMG Telecom Products was sold for £265m (US $525m) to private investors Atlantic Bridge Ventures and Access Industries, and became known as Acision.

[61] In December 2011, Logica announced it would cut 1,300 jobs or around 3 percent of the workforce spread across Benelux, the United Kingdom and Sweden, to save 50 to 60 million pounds a year from the second half of 2012.

[57] The acquisition would give CGI a large presence in Europe for the first time and make it the sixth-largest IT services provider in the world.

[69] During the 1980s and 1990s Logica ran an extensive graduate recruitment programme that resulted in the company having a relatively young workforce.