David Lorge Parnas (born February 10, 1941) is a Canadian early pioneer of software engineering, who developed the concept of information hiding in modular programming, which is an important element of object-oriented programming today. He is also noted for his advocacy of precise documentation.

Assessment of safety-critical software in nuclear power plants.

This paper discusses modularization as a mechanism for improving the flexibility and comprehensibility of a system while allowing the shortening of its development time. The effectiveness of a “modularization” is dependent upon the …

Dr. Parnas is Professor Emeritus at McMaster University in Hamilton Canada, and at the University of Limerick Ireland. He is an Honorary Professor at Ji Lin University in China.

A call such as SETCHAR(rpv,c,d) will cause the cth character in the wth word of the rth line to be the character represented by d (i.e. CHAR(r,w,c) = d). WORDS(r) returns as value the number of words in line r .

D. L. Parnas Department of Computer Science Carnegie-MelIon University Pittsburgh, Pa. ABSTRACT This paper discusses modularization as a mechanism for improving the flexibility and comprehensibility of a system while allowing the shortening of its development time. The effectiveness of a "modulariza

Parnas articulates the timeless software design concepts known as information hiding and abstract interfaces. Most programmers would describe a module as a unit of code such as a sub-routine or class. Parnas focuses on the programmers rather than the programs.

David Lorge Parnas, P.Eng. Ottawa, Ontario, Canada. Born: 10 February 1941. Citizen of Canada. The term “software engineering” was coined to suggest that those who design and build software should work with the professional knowledge and discipline that is …

David Lorge Parnas: Software Engineering: Multi-person Development of Multi-version Programs. Dependable and Historic Computing 2011: 413-427

David Lorge Parnas is a professor emeritus at McMaster University, Hamilton, Ontario, Canada, and the University of Limerick as well as president of Middle Road Software, Inc., Ottawa, Ontario, K1V 1V5, Canada. He is a Fellow of IEEE and ACM. Contact him at [email protected].