Atefeh Khosravi - MS student of software engineering, Islamic Azad University-Tehran Northern Branch, Tehran, Iran,
Nasser Modiri - Lecturer at department of computer engineering, Islamic Azad University of Zanjan, Zanjan,

The main goal of producing a software application is to support requirements which the software is designed for. As a software supports stakeholders’ requirements morecomplete and accurate, it will become more successful and accepted. In this paper we focus on essential role of requirementengineering. And according to quality definitions and models, we investigate the impact of requirement engineering on quality -as a non-functional requirement- during software product life cycle.

Requirement Engineering, Software Quality, ISO/IEC 9126, Software Life Cycle, Effect of RE on Quality