David Parnas
David Parnas
David Parnas.jpg
Born (1941-02-10) February 10, 1941 (age 76)
Plattsburgh, New York, United States
Known for Information hiding, Strategic Defense Initiative activism
Scientific career
Doctoral advisor Alan Perlis
Everhard Mott Williams
Doctoral students Richard J. Lipton
Steven M. Bellovin

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.

Life

Parnas earned his Ph.D. at Carnegie Mellon University in electrical engineering. Parnas also earned a professional engineering license in Canada and was one of the first to apply traditional engineering principles to software design. He worked there as a professor for many years. He also taught at the University of North Carolina at Chapel Hill (U.S.), the Technische Universität Darmstadt (Germany), the University of Victoria (British Columbia, Canada), Queen's University in Kingston, Ontario, McMaster University in Hamilton, Ontario, and University of Limerick (Republic of Ireland).

David Parnas received a number of awards and honors:

Work

Modular design

In modular design, his double dictum[] of high cohesion within modules and loose coupling between modules is fundamental to modular design in software. However, in Parnas's seminal 1972 paper On the Criteria to Be Used in Decomposing Systems into Modules, this dictum is expressed in terms of information hiding, and the terms cohesion and coupling are not used. He never used them. [2]

Technical activism

Dr Parnas took a public stand against the US Strategic Defense Initiative (also known as "Star Wars") in the mid 1980s, arguing that it would be impossible to write an application of sufficient quality that it could be trusted to prevent a nuclear attack.[3] He has also been in the forefront of those urging the professionalization of "software engineering" (a term that he characterizes as "an unconsummated marriage"). Dr. Parnas is also a heavy promoter of ethics in the field of software engineering.

Stance on academic evaluation methods

Parnas has joined the group of scientists which openly criticize the number-of-publications-based approach towards ranking academic production. On his November 2007 paper Stop the Numbers Game,[4] he elaborates on several reasons on why the current number-based academic evaluation system used in many fields by universities all over the world (be it either oriented to the amount of publications or the amount of quotations each of those get) is flawed and, instead of generating more advance of the sciences, it leads to knowledge stagnation.

Bibliography

See also

References

  1. ^ GI-Fellow citation, retrieved 2012-03-09.
  2. ^ Parnas 1972.
  3. ^ Parnas D.L. (December 1985). "Software aspects of strategic defense systems". Comm ACM. 28 (12): 1326-35. doi:10.1145/214956.214961. 
  4. ^ Parnas, David (November 2007). "Stop the Numbers Game". Communications of the ACM. 50 (11): 19-21. doi:10.1145/1297797.1297815. 

Further reading

External links


  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.


David_Parnas
 



 

Connect with defaultLogic
What We've Done
Led Digital Marketing Efforts of Top 500 e-Retailers.
Worked with Top Brands at Leading Agencies.
Successfully Managed Over $50 million in Digital Ad Spend.
Developed Strategies and Processes that Enabled Brands to Grow During an Economic Downturn.
Taught Advanced Internet Marketing Strategies at the graduate level.


Manage research, learning and skills at defaultLogic. Create an account using LinkedIn or facebook to manage and organize your IT knowledge. defaultLogic works like a shopping cart for information -- helping you to save, discuss and share.


  Contact Us