Welcome to the proceedings of ECOOP 2009! Thanks to the local organizersfor working hard on arranging the conference - with the hard work they put in, it was a great success. Thanks to Sophia Drossopoulou for her dedicated work as PC Chair in assembling a ?ne scienti?c program including forward-looking keynotes, and for her e?orts to reduce the environmental impact of the PC meeting by replacing a physical meeting with a virtual meeting. I would also like to thank James Noble for taking the time and e?ort to write up last year's banquet speech so that it could be included in this year's proceedings. One of the strong features of ECOOPis the two days of workshopspreceding themainconferencethatallowsintenseinteractionbetweenparticipants.Thanks to all workshop organizers. Lastyear'ssuccessfulsummerschooltutorialswerefollowedupthisyearwith seven interesting tutorials. Thanks to the organizers and speakers. This year's Dahl-Nygaard award honored yet another pioneer in the ?eld, namely, David Ungar for his contributions includingSelf. I appreciate his e?orts in providing us with an excellent award talk. The world is changing and so is ECOOP. Please contemplate my short note on the following pages entitled On Future Trends for ECOOP.

ETAPS2008wasthe11thinstanceoftheEuropeanJointConferencesonTheory and Practice of Software. ETAPS is an annual federated conference that was established in 1998 by combining a number of existing and new conferences. This yearit comprised?ve conferences (CC, ESOP,FASE, FOSSACS, TACAS), 22satelliteworkshops(ACCAT,AVIS,Bytecode,CMCS,COCV,DCC,FESCA, FIT, FORMED, GaLoP, GT-VMT, LDTA, MBT, MOMPES, PDMC, QAPL, RV,SafeCert,SC,SLA++P,WGT,andWRLA),ninetutorials,andseveninvited lectures (excluding those that were speci?c to the satellite events). The ?ve main conferences received 571 submissions, 147 of which were accepted, giving an overall acceptance rate of less than 26%, with each conference below 27%. Congratulationsthereforetoallthe authorswhomadeittothe ?nalprogramme! I hope that most of the other authors will still have found a way of participating in this exciting event, and that you will all continue submitting to ETAPS and contributing to make of it the best conference in the area. The events that comprise ETAPS address various aspects of the system - velopment process, including speci?cation, design, implementation, analysis and improvement. The languages, methodologies and tools which support these - tivities are all well within its scope. Di?erent blends of theory and practice are represented, with an inclination towards theory with a practical motivation on the one hand and soundly based practice on the other. Many of the issues involved in software design apply to systems in general, including hardware s- tems, and the emphasis on software is not intended to be exclusive.