Hi. In case you like some reading for your trip to OGF, I am forwarding some references Karim Djemame sent me. I have not looked into them yet myself but they look relevant to our session on negotiation. --- Giuseppe Di Modica, Valerio Regalbuto, Orazio Tomarchio, Lorenzo Vita: Enabling re-negotiations of SLA by extending the WS-Agreement specification. IEEE SCC 2007: 248-251 Giuseppe Di Modica, Valerio Regalbuto, Orazio Tomarchio, Lorenzo Vita: Dynamic re-negotiations of SLA in service composition scenarios. EUROMICRO-SEAA 2007: 359-366 Dynamic SLA-negotiation based on WS-Agreement. Antoine Pichot - Alcatel-Lucent, Philipp Wieder - Research Centre Jülich, Wolfgang Ziegler, Oliver Wäldrich - Fraunhofer Instiute SCAI. http://www.coregrid.net/mambo/images/stories/TechnicalReports/tr-0082.pdf Some other useful references on WS-Agreement: G. Frankova, D. Malfatti, and M. Aiello, Semantics and Extensions of WS-Agreement. (2006) Journal of Software 1(1):34-42. M. Aiello, G. Frankova, and D. Malfatti, What's in an Agreement? An Analysis and an Extension of WS-Agreement. (2005) LNCS 3826:424-436, Int. Conf. on Service-Oriented Computing (ICSOC) 2005 Springer. --- Best regards, Dominic