[ cite web|url=http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=637156 |title="Metrics and laws of software evolution-the nineties view"|date=Sept 1980 |publisher=Proceedings of the IEEE] . The first two:]# Software must continually evolve, or grow useless, and
# The structure of evolving software tends to degrade.
ee also
* Sam Williams
External links
* [http://www.doc.ic.ac.uk/~mml/feast2/papers.html FEAST Publications]
* [http://ieeexplore.ieee.org/search/freesrchabstract.jsp?arnumber=1456074&isnumber=31293&punumber=5&k2dockey=1456074@ieeejrns&query=%28programs++life+cycles+and+laws+of+software+evolution%29%3Cin%3Emetadata&pos=1 IEEExplore]
* [http://archive.salon.com/tech/feature/2002/04/08/lehman/index.html A unified theory of software evolution] , Salon.com, 2002.
* [http://www.ieee.org/web/aboutus/history_center/oral_history/abstracts/lehmanab.html IEEE History Center: Meir Lehman Abstract]
* [http://www.cs.mdx.ac.uk/staffpages/mml/ Manny Lehman's Home Page]
References
* M.M. Lehman. "Programs, life cycles, and laws of software evolution", "Proceedings of the IEEE", pages 1060–1076, September 1980