Inspection is not enough
Deming is world famous, especially in the Agile/Lean world. During his life Deming taught top management how to improve design (and thus service), product quality, testing and sales. His name is synonymous to quality improvement and his philosophies are still seen as visionary.
One of Deming’s principles is: “Cease dependence on inspection to achieve quality. Eliminate the need for massive inspection by building quality into the product in the first place.” Sounds good, right? In stead of testing every last inch of your product, you increase it’s intrinsic quality which is more sustainable, has a direct benefit for the customer and eventually lowers cost.
Now how does that relate to software development? In software development we do quite a bit of inspection, not only by peer reviews but mostly by testing. We test documents, units of code, modules of code, systems, user interfaces, services etc. We test functionality, speed, error handling, ease of use, fit for purpose etc. etc. My interpretation of what Deming would say to us: focus less on creating more tests, focus more on product and process quality.