Roy H. Campbell, Skevos Evripidou, Anja Schanzenberger. PerSys 2007 PC Co-chairs Message. In Robert Meersman, Zahir Tari, Pilar Herrero, editors, On the Move to Meaningful Internet Systems 2007: OTM 2007 Workshops, OTM Confederated International Workshops and Posters, AWeSOMe, CAMS, OTM Academy Doctoral Consortium, MONET, OnToContent, ORM, PerSys, PPN, RDDS, SSWS, and SWWS 2007, Vilamoura, Portugal. Volume 4806 of pages 761, Springer, 2007. [doi]