Web application development is under certain circumstances such as a strong emphasis on time-to-market characterised by the usage of informal and ad-hoc development practices and a lot of tacit knowledge. Here we present an experiment that has been carried out in order to evaluate a recently proposed release planning method for web application development. This method aims at bringing stakeholders together to share knowledge and to decide on a configuration for the next release that satisfies all stakeholders. The method has been evaluated in terms of its effect on factors such as knowledge sharing, understanding, support to reach a consensus and stakeholders satisfaction.