How do metric ranges work?

Hi!

When dealing with metrics, it is important to define its metric ranges because they will provide the proper quality function.

RQA users can specify the quality level corresponding to the quality function defined for this metric. There are two ways to define a quality function:

• By range: select a lower and an upper limit. It is important to know that the system takes lower limits as included values in the specified interval and upper limits don’t. To set an infinity value, just check it on the right of the limit.
• By point: select a quantitative value and the qualitative value selected will only affect this point.
• Both: sometimes the quality function needs both at the same time: ranges and points

It is also possible to enable/disable the Mandatory option. This is useful during the CCC Requirement Quality Assessment because it set the quality level into a higher priority against the others metrics. Then, it is not obligatory but we recommend to also set a Summary and a Description for this new range.

A good practice is to create preset metric ranges. This is very useful after creating a new metric with no ranges at the moment.

Of course, it is also possible to edit and/or delete any metric range. However, notice that if a metric does not have a quality function, it will always return a LOW value.

Bye!