**6. Evolutionary phases**

An evolutionary phase is a transition from the current state of the system configuration to the next stage with newly system features applied into the system. There could be major changes or simple minor adjustments. System architects and stakeholders may pre-set the threshold on defining the degree of "evolutionary phases" specific to a system's functionalities or services provided to the end users. As a simple example of a onedimensional measure the receipt of X or greater number of "feature-adding" task-requests within one cycle will trigger an inception phase and prepare for an upcoming evolution. The number X can vary based on the type and service of the underlying system. Such measures can be made composite to incorporate other necessary measurement metrics.
