RCOST - Research Centre on Software Technology QoS-Aware Replanning of Composite Web Service Execution (TECHNICAL REPORT 001-05) Gerardo Canfora, Massimiliano Di Penta, Raffaele Esposito, Maria Luisa Villani RCOST — Research Centre on Software Technology Department of Engineering - University of Sannio Viale Traiano - 82100 Benevento, Italy {canfora, dipenta, r.esposito, villani}@unisannio.it February 2005