Dear colleagues, as in the previous years, we are organizing a workshop on Service Level Agreements at the eChallenges conference (this year in Warsaw, Poland; see http://www.echallenges.org). The scope of the workshop and the topics of interest are detailed in the attached workshop description. If you plan to submit a paper, please contact us via email (econtractingws-general@gforge.hlrs.de) before the submission deadline (please include the paper's topic). Also, please indicate at the submission of your paper that it is aimed at this workshop by entering the workshop's name into the respective box. The deadline for submitting an extended abstract (1200-1500 words) is 26 February 2010. Please feel free to distribute this invitation to your colleagues. Best Regards, Peer Hasselmeyer, Bastian Koller, Maria Tsakali, Philipp Wieder.