Review Rate. In the PSP design and code reviews, engineers personally review their programs.
The PSP data show that when engineers review designs or code faster than about 150
to 200 new and changed LOC per hour, they miss many defects. With the PSP, engineers
gather data on their reviews and determine how fast they should personally review programs
to find all or most of the defects.
Development Time Ratios. Development time ratios refer to the ratio of the time spent by an
engineer in any two development phases. In the PSP, the three development time ratios used
in process evaluation are design time to coding time, design review time to design time, and
code review time to coding time.