Although the majority of work in the AOSD community focuses on general-purpose aspect languages (eg. AspectJ), seminal work on AOSD proposed a number of domain-specific aspect languages, such as COOL for concurrency management and RIDL for serialization. A growing trend of research in the AOSD community is returning to this seminal work, motivated by the known advantages of domain-specific approaches, as argued by Mitchell Wand in his keynote at ICFP 2003. This workshop is conceived for researchers who are further exploring the area of domain-specific aspect languages, including language design, enabling technologies and composition issues. This volume contains 6 papers and abstracts of invited talks. We hope the reader will find them useful for advancing their understanding of some issues in concerning the design of aspect languages.