books that reports or web site that addresses the topic of bugs per line of code
The book "Code Complete" by Steve McConnell has a brief section about error
expectations. He basically says that the range of possibilities can be as
follows:
(a) Industry Average: "about 15 - 50 errors per 1000 lines of delivered
code." He further says this is usually representative of code that has some
level of structured programming behind it, but probably includes a mix of
coding techniques.
(b) Microsoft Applications: "about 10 - 20 defects per 1000 lines of code
during in-house testing, and 0.5 defect per
KLOC (
KLOC IS CALLED AS 1000 lines of code) in released
product (Moore 1992)." He attributes this to a combination of code-reading
techniques and independent testing (discussed further in another chapter of
his book).
(c) "Harlan Mills pioneered 'cleanroom development', a technique that has
been able to achieve rates as low as 3 defects per 1000 lines of code during
in-house testing and 0.1 defect per 1000 lines of code in released product
(Cobb and Mills 1990). A few projects - for example, the space-shuttle
software - have achieved a level of 0 defects in 500,000 lines of code using
a system of format development methods, peer reviews, and statistical
testing."
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Vinnie Murdico
Software with Brains, Inc.
SWBTracker - Value-Priced Defect Management Software http://www.softwarewithbrains.com