There are some Quality attributes they are:
It can be expressed in the following two ways
The amount of time needed to test the software to ensure that it is performing according to specified requirements or not.
The ability of the software to reveal defects under the given testing conditions or the test cases.
some softwares are tested in a way that the errors or defects are hidden during the ordinary testing conditions.
“Testers must work with the developers,analysts,designers throughout the software development life cycle system to ensure that testability issues are addressed.”