application scope, it can be divided into holistic and local methods.

Software quality assurance refers to the planned and organised activities carried out to ensure that a software system
or software products fully meet the required quality, these activities are planned and organised throughout all phases of software production, i.e. the entire life cycle. There are two types of software quality characteristics metrics: predictive and acceptance. Commonly used international software quality models are ISO/IEC9126 and the McCall model.