Chikh, Mohammed AmineMerzoug, MohammedKameche, Zineb2013-04-102013-04-102012doi: 978-1-4673-1167-0https://dspace.univ-tlemcen.dz/handle/112/1729The growing number of web service over the internet urges us to conceive an efficient selection approach, especially for composite requests. In general, we can find a set of services that provide the same functionality (inputs/outputs), but differ in QOS criteria, in this situation we must select the best ones, by applying some optimization algorithm. In this paper, we propose a reactive multi-agent solution, based on swarm particle optimization. The proposed system adopts a set of particle's groups, which explore the space search in order to maximize a single objective function. The obtained results show a high rate of optimality and merit to be continued.enArticle