[Note] 2. Statistical data on Software Quality

A key fact: the best way to improve development efficiency and quality-Reduce Code Rework time. No matter the reason for rework is demand/design/debugging.

The average production efficiency of software products in the industry is 10-50 lines of final delivery code per person per day [including all non-coding expenses]. ?? -- How is the time spent?

Although the non-coding work of testers, project managers, administrative support, and designers is included, it is not the main reason for time consumption.

Debugging, correction, refactoring, and rework are the most expensive time overhead for software development. A conclusion from IBM's research:
Software projects with the least defects have the shortest development cycle and the highest efficiency. Eliminating Software defects is the most time-consuming software work. About 50% of the total resources in traditional immature development methods

Another phenomenon:
The fastest and slowest development speedProgramThe average number of defects generated by members is the least. Medium Speed is the maker of the most defects.

Improvement Method: by allocating resources and preventing defects with low-cost quality assurance, we can avoid costly job suspension.

Appendix [Reference Data]: Vulnerability Detection rate evaluation data for eXtreme Programming

measure	minimum detection rate	typical detection rate	optimal detection rate
informal design review [pairing]	25%	35%	40%
informal code review [pairing]	20%	25%	35%
personal code review	20%	40%	60%
unit test	15%	30%	50%
integration test	25%	35%	40%
regression test	15%	25%	30%
expected cumulative efficiency	74%	90%	97%