The secondary model was based on the classical Square Root equation, which displayed a good linear relationship between the growth rate of Aspergillus versicolor and temperature.

This leads to a "black-box" usage model, where a service may utilize other services without the client's knowledge, thereby propagating changes with secondary effects.

Due to the focus on goals and metrics, the maturity model enabler is secondary for performance management (e.g., there is no such thing as AD hoc decentralization of performance measurement).