This book documents the satellite events run around the 15th European Conference on Object-Oriented Programming, ECOOP 2001, held in Budapest, Hungary, in June 2001. This book presents 17 value-adding workshop reports, and the documentation of a panel and the posters. All in all, the book offers a comprehensive and thought-provoking snapshot of the current research in object-oriented technology, ranging from theoretical and foundational issues to applications in various domains.