I. Introduction
“Although quality is pursued in order to satisfy users, it is important to note that the quality desired by users is not universal but rather subject to constant change.” [1]. Developing a software product that responds to the customers' requirements, and offers high value to both the development company and the customer, increases the likelihood of market success. Therefore, software quality requirements (SQR) play a central role and can be seen as a key competitive advantage [2]. The international research standardization project SQuaRE (Software Quality Requirements and Evaluation) developed the ISO/IEC standard series 250nn for software product quality, evaluated from the users and stakeholder's point of view. The ISO/IEC 25010 standard [3], which has replaced the ISO/IEC 9126–1 [4], defines internal, external quality characteristics and quality in use characteristics. It should be noted that “user requirements and expectations are growing increasingly diverse, and the importance given to each quality characteristic varies with individual users (and stakeholders). In some cases, what is desirable to one user is not so to another” [1].