Bugs per lines of code

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."

Vinnie Murdico Software with Brains, Inc. 

SWBTracker - Value-Priced Defect Management Software 

http://www.softwarewithbrains.com

dear tester's

this was my first post. i do like to update this blog every day and i need all your assistance for the people who just started learning the testing.