Cleanroom Software Engineering

The Cleanroom Software Engineering process is a software development process intended to produce software with a certifiable level of reliability. The Cleanroom process was originally developed by Harlan Mills and several of his colleagues including Alan Hevner at IBM [cite journal|last=Mills|first=H.|authorlink=Harlan Mills|coauthors=M. Dyer and R. Linger|title=Cleanroom Software Engineering|journal=IEEE Software|volume=4|issue=5|month=September|year=1987|pages=19–25|doi=10.1109/MS.1987.231413] . The focus of the Cleanroom process is on defect prevention, rather than defect removal. The name "Cleanroom" was chosen to evoke the cleanrooms used in the electronics industry to prevent the introduction of defects during the fabrication of integrated circuits. The Cleanroom process first saw use in the mid to late 80s. Demonstration projects within the military began in the early 1990s [cite web
last = Foreman
first = John
year = 2005
url = http://www.sei.cmu.edu/str/descriptions/cleanroom_body.html
title = Cleanroom Software Engineering
work = [http://www.sei.cmu.edu/str/index.html Software Technology Roadmap]
publisher = [http://www.sei.cmu.edu/sei-home.html Software Engineering Institute (SEI)]
accessdate = 2006-04-27] . Recent work on the Cleanroom process has examined fusing Cleanroom with the automated verification capabilities provided by specifications expressed in CSP [cite paper|author=Guy H. Broadfoot and P. J. Hopcroft|title=Introducing formal methods into industry using Cleanroom and CSP|publisher=Dedicated Systems e-Magazine|url=http://www.realtime-info.be/Magazine/emagazine/fulltext/2005Q1_1.pdf|date=2005|accessdate=2006-04-27] .

Central principles

The basic principles of the Cleanroom process are

;Software development based on formal methods: Cleanroom development makes use of the Box Structure Method to specify and design a software product. Verification that the design correctly implements the specification is performed through team review.

;Incremental implementation under statistical quality control: Cleanroom development uses an iterative approach, in which the product is developed in increments that gradually increase the implemented functionality. The quality of each increment is measured against pre-established standards to verify that the development process is proceeding acceptably. A failure to meet quality standards results in the cessation of testing for the current increment, and a return to the design phase.

;Statistically sound testing: Software testing in the Cleanroom process is carried out as a statistical experiment. Based on the formal specification, a representative subset of software input/output trajectories is selected and tested. This sample is then statistically analyzed to produce an estimate of the reliability of the software, and a level of confidence in that estimate.

References

Further reading

* cite book
last = Stavely
first = Allan
year = 1999
title = Toward Zero-Defect Programming
publisher = Addison-Wesley

* cite book
author = Stacy J. Prowell and Carmen J. Trammell and Richard C. Linger and Jesse H. Poore
year = 1999
title = Cleanroom Software Engineering: Technology and Process
publisher = Addison-Wesley

* cite book
author = Jesse H. Poore and Carmen J. Trammell
year = 1996
title = Cleanroom Software Engineering: A Reader | publisher = NCC Blackwell

External links

* [http://www.uta.edu/cse/levine/fall99/cse5324/cr/clean/page1.html An introduction]