Total Quality Index measures the general maintainability level of the application based on hundreds of metrics provided by CAST.
Robustness measures the level of risk and the likelihood of having application failures and defects resulting from modifications.
Security measures the likelihood of potential security breaches linked to coding practices and application source code.
Efficiency measures the likelihood of potential performance bottlenecks and the potential future scalability issues linked to coding practices.
Changeability measures how easily applications can be modified in order to implement new features, correct errors, or change the applications environment.
Transferability measures how easily applications can be moved across teams or team members including in-house and outsourced development teams.