Architecture Fitness Functions provide an objective measurement of some sort of architectural characteristic (such as scalability, reliability, and so on). In this lesson Mark Richards describes what an architecture fitness function is and provides examples of practical architecture fitness functions.
Reference Links:
Building Evolutionary Architecture:
https://www.amazon.com/Building-Evolutionary-Architectures-Support-Constant/dp/1491986360
Fundamentals of Software Architecture: https://www.amazon.com/gp/product/1492043451
Training Classes: https://www.developertoarchitect.com/training/