Statistics form NIST :
●NIST
(National
Institute of Standards and Technology) has published a comprehensive (309
pages) and very interesting report on project statistics and experiences based
on data from a large number of software projects1
§70% of the defects are introduced in the specification
phase
§30% are introduced later in
the technical solution process
§Only 5% of the specification inadequacies are
corrected in the specification phase
§95% are detected later in
the project or after delivery where the cost for correction on average is 22
times higher compared to a correction directly during the specification effort
§The NIST report concludes that extensive
testing is essential, however testing detects the dominating specification
errors late in the process.
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Why Focus on Requirements ?
