I. P. Sharp Associates, IPSA for short, was a major Canadian computer time sharing, consulting and services firm of the 1970s and 80s. IPSA is particularly well known for its work on the APL programming language, and an early packet switching computer networking system known as IPSANET, and a powerful mainframe-based e-mail system ultimately known as 666 BOX. It was purchased in 1987 by Reuters, which used them until 2005 as a data warehousing center for business data.

The company started as a team of eight working at the Toronto division of Ferranti, Ferranti-Packard, which sold numerous products to the Canadian military and large businesses.

[http://en.wikipedia.org/wiki/I.P.Sharp_Associates] (consulted at 13/10/09)