Capers Jones is one of the most prolific software researchers around. He has a vast collection of metrics from many thousands of real-world projects. His book The Economics of Software Quality is rather dry but full of fun facts. He’s careful to point out that the data has huge standard deviations, but it does paint some interesting pictures about the nature of software engineering.
Chapter 2 is called “Estimating and Measuring Software Quality.” Though all of the numbers are interesting those for requirements are especially so.
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