The main objectives of the work herein presented were to de- fine and build a platform for workflow-based continuous on-line validation of systems and to study its application to an e-business marketplace website implemented with the emerging Web Services technology, by many considered the new revolution in the world wide web context. This work took place in the form of one of the case studies developed in the Eurescom project P1108: “Workflow-based on-line validation of complex component based Internet services”.