3 posts
IBM's Cleanroom engineering achieved defect rates 100× better than industry average, then faded into obscurity.
IBM's Cleanroom software engineering process delivered 0.1 defects per thousand lines of code. The industry average at the time was between 10 and 50. The…
Cleanroom software engineering promised zero-defect increments through mathematical verification instead of debugging.
The software industry average in the 1980s was 30 to 60 defects per thousand lines of code. IBM's Cleanroom team shipped a 20,000-line compiler increment with…
IBM's Cleanroom engineering process achieved defect rates 100× better than industry average by preventing bugs instead of finding them.
IBM shipped a NASA satellite control system with 0.1 defects per thousand lines of code. The industry average at the time was between 10 and 50. They did not…