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David Pearson (computer scientist)
David Pearson is a British physicist and computer scientist. He has degrees in physics and theoretical physics from London University and Imperial College of Science and Technology, and in computer science from the University of Cambridge, where he did his postgraduate research. He is an Associate of the Royal College of Science. He joined International Computers Limited in 1968 and became Head of Software Engineering, responsible for CADES, the development system for the ICL 2900 Series Operating System and one of the earliest comprehensive systems software engineering development environments. After spending four years as Director of Advanced Development for Bell-Northern Research in Ottawa, he became the founder and President of Orcatech, one of the world's first intelligent graphics workstation companies. He went on to become the founding Chief Executive of the Strathclyde Institute in Glasgow, Scotland, Senior Director of Scottish Enterprise and Chief Executive for the economic development agency for Norfolk and Waveney. Before moving back to Canada, he spent three years as Chief Operating Officer of the Industrial Society, later to become the Work Foundation. He has Canadian and British citizenships.
==ICL CADES==
Pearson started his career at International Computers Limited. He was involved in the early development work of the VME/B operating system for ICL’s 2900 Series. He was the innovator and architect of the CADES software engineering system〔B.C.Warboys "The IPSE 2.5 Project: Process Modelling as a basis for a support environment" International Conference on System Development Environments and Factories, May 1989, Berlin〕〔Martin Campbell-Kelly "ICL: A business and technical history" Clarendon Press, Oxford 1989〕 that was the foundation of VME/B development activities for over 20 years, and he led its development team until 1977.
In designing the initial architecture of the CADES environment, Pearson in particular looked to parallels with the leading hardware computer-aided design systems of the time, even attempting the use of graphics in the design process.〔D.J.Pearson "CADES - Computer-aided development and evaluation system" Computer Weekly, 1973〕〔D.J.Pearson and B.C.Warboys "Structural Modelling - A Philosophy" OSTC/IN/40 July 1970〕 CADES was one of the first effective software engineering environments to be used for the development of large-scale software.〔G.D.Pratten and R.A.Snowden "CADES, support for the development of complex software" EUROCOMP,1976〕〔M.A.Firth and Others "Improving a software development environment using object-oriented technology" TOOLS (8), 1992〕〔B.W.Chatters, M.M.Lehman and Others "Modelling a software evolution process" Software Process: Improvement and Practice, September 2000〕 After 30 years, the system was still in use by Fujitsu to maintain the ICL operating system.
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