Organizations seek to ensure their products or services meet the required quality standards to inspire confidence among the users. The mandate is assigned to an independent quality assurance department whose primary goal is to certify that the products or services meet the necessary quality requirements Hartmut & Bernd-Holger. Therefore, the quality assurance department must provide an operational and effective quality assurance system. The system must be independent of other functional units. It must frequently perform quality review undertakings (self-inspection audits/internal audits) to guarantee compliance with high-quality working practices and company quality standards.
The fault models are commonly used in the areas of hardware and software testing. These models exist in many forms that can help define the fault and how to test for it or suggest a method to describe the input part in case of testing. Memon states that fault models help to indicate errors in the operation or construction of a piece of software, structure, or equipment. For that reason, it can form a vital component of the quality assurance system for which an organization can have confidence the final product of services meets the quality requirements.