7. One Architect/Analyst can generate enough work for two Developers and one Tester, structure your project teams in this ratio.
This is actually one of those “rules of thumb” that have been borne out over time. (The ratio may vary a bit from case to case, like when the experience levels are different across the roles.) This ratio combines with the specialization of Principle #6 to form the strong basis for the Cascade effect covered in Principle #13. … so stay tuned.