Metrics help to look at the performance of a project attribute in a measurable way. They are useful for some different point:
- Only what is measured can be managed;
- Help control the process and the output;
- Help understand the process performance.
We can have one primary metric in a project and more secondary ones.
The primary metrics are about the Y outcome, so we can say that is to measure the most critical Critical To Quality characteristic.
Example: The process is about improving the entire life cycle of the new project, starting from the estimation arriving at the release into production and the successive Application Management. The primary CTQ can be releasing the project on time; the primary metrics can be the number of days.
Secondary metrics are linked to the other variable, X1.Xn to the process that if they don’t work, impact the Y. We can found it with the other CTQ characteristics.
Example: Continuing with the previous example, we can say that secondary metrics can be linked to the CTQ of the number of tickets opened when the product goes into production. So the metrics are the number of tickets.
For the exam you need to remember that:
- Metrics helps keep the attribute measurable;
- On an improvement project, you can have only one primary metric and some other secondary;
- Metrics came from the Critical to Quality Attributes.