This volume contains the reports from the workshopsheld at the 21st European Conference on Object-Oriented Programming - ECOOP 2007 - at Technische Universit. atBerlin.Nineteenworkshopswereheldinthecourseofthis conference onJuly30andJuly31,2007,coveringalargespectrumofhotresearchtopics.As in previouseditions of ECOOP,numerousscientists fromacademia andindustry tookthechancetopresentinnovativeandtopicalideasinanenvironmento ering optimal conditions for exciting discussions and fruitful interactions. The Workshop Reader which contains the reports from the workshops has beenasubstantialpartoftheECOOPconferenceformorethan10years.During the pre-conference phase the workshop organizers are invited to author a report about their workshops where they have the opportunity to describe the state of the art,the discussionsandthe trends inthe ?elds oftheirworkshop.Inaddition some of the organizational aspects may be discussed. This volume collects 19 reports from high-quality workshops whose topics were related to selected aspects in the ?eld of object-oriented programming and technology. Following the example of previous workshop readers we introduced some notions in order to establish thematic clusters. These notions are (1) P- gramming Languages, (2) Aspects, (3) Formal Techniques, Roles, Components, (4) Software Engineering, and (5) Applications. Three months after the conference we are now able to present the reports which describe the state of the art, the discussions and the relevant trends in the research ?elds addressed by the workshops. In sum, each of these reports thus contributes to a panoptic overview of the current tendencies in the lively ?eld of object-oriented programming and technology. Readers from academia and industry who want to be informed about the current developments in this research area thus can highly pro t from this volume.
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