**7.1.3 Assessment of APPTRACK**

APPTRACK also has a rolling usage patterns. Again, regression analyses shows close ties between TC and SV in 2008 and 2010 and incidcates either environmental disturbances or large changes in usage patterns in 2009.

In summary, thorough analyses of a carefully designed set of relevant metrics, as well as the underlying development track history, open up many possible experiments for closely studying system dynamics over a period of time. Upon maturity, these metrics of measurements would form the foundation for developing futher statistical models to drive a set of tools for managing evolvable systems.
