Abstract : Stakeholders participation is recognized as a key issue in the development of useful and usable systems. The Web has given rise to a growing number of collaborative working tools that facilitated the participation of stakeholders (and especially end-users). These tools create new opportunities of practice regarding requirement elicitation. Nevertheless, they result in an information overload lacking structure and semantics. Consequently, requirements analysis and selection becomes more challenging. In this paper, we propose an approach based on semantic web languages as well as concept lattices to identify relevant groups of stakeholders depending on their past participation. These groups can be used to enable facilitated decision-making and handling of requirements. We detail the different steps and the possible configurations, using an example inspired by a collaborative software development environment.