There is no one right answer to what a cloud native architecture is; many types of architectures could fall into the cloud native category. Using the three design principles or axes—cloud native services, application centric design, and automation—most systems can be evaluated for their level of cloud native maturity. In addition, since these principles are ever expanding as new technologies, techniques or design patterns are developed, and so the maturity of cloud native architectures will continue to mature. We, the authors of this book, believe that cloud native architectures are formed by evolution and fall into a maturity model. For the remainder of this book, cloud native architectures will be described using the Cloud Native Maturity Model (CNMM), following the design principles outlined, so that architecture patterns can be mapped to their point of evolution: