Previous workshops on reflection both in ECOOP and in OOPSLA have pointed out the growing interest and importance of Reflection and Metalevel Architectures in the fields of programming languages and systems (ECOOP’98, OOPSLA’98), software engineering (OOPSLA’99) and middleware (Middleware 2000). Following these workshops but also the conference Reflection’99 held in Saint-Malo (France), this workshop has provided an opportunity for researchers with a broad range of interests in meta-level architectures and reflective techniques to discuss recent developments in this field. It has also provided a good test-bed for preparing them to submit their works to Reflection’01. The workshop main goal is to encourage people to present works in progress. These works could cover all the spectrum from theory to practice. To ensure creativity, originality, and audience interests, participants have been selected by the workshop organizers on the basis of 5-page position paper. We hope that the workshop will help them to mature their idea and improve the quality of their future publications based on the presented work.