Requirements are the heart of Information Systems Development because they determine what the system will operate. Requirements elicitation aims to identify the stakeholders' needs for the Information System. It is a critical and error-prone activity based on an intense communication between several stakeholders with different levels of background that do not always know own needs. Despite many years of research efforts, errors in this activity still occur frequently, cost more if discovered at the implementation stage and are very hard to fix. As a result, these errors represent major causes...