This memo cites people saying that the maintenance costs for a software product are higher then its development.
For every $1 you spend of software development, you will spend $2 on maintenance. 
Only about 15% of software development effort is devoted to programming. 
Finding and fixing a software problem after delivery costs 100 times more than finding and fixing the problem in early design phases. 
The most expensive phase of software development is maintenance. 
Je später ein Fehler in den Anforderungen im Verlauf des Entwicklungspprojekts behoben wird, umso höher sind die damit verbundenen Kosten. 
 Royce Walker, Next-Generation Software Economics, The Rational Edge, December 2000.
 Robert C. Martin, Granularity, The C++ Report Vol. 8 Number 10, December 1996.
 Barry W. Boehm, Software Engineering Economics, Prentice-Hall, September 1981.
Date published: 2011-01-13
Date modified: 2014-12-24
Keywords: Software maintenance