Ratings and profilesfor system assessment
Metrics ratings are necessary for system assessment;
Ratings alone give only a local snapshot of the class or an evaluation of mean values;
Metrics trends are mandatory for a global project assessment.
Notes:
According to ISO9126 quality standard metrics rating are necessary for the acceptance or rejection of a system.
In our opinion ratings alone can give only a local snapshot of a class or a global evaluation for the mean values among all the system classes.
The definition of a trend instead of mean values for all the system classes allows the project manager to identify classes or cluster of classes that are not compliant to the target specified by the trend.