Over the past decade, the Open Source Software (OSS) phenomenon has had a global impact on the way organisations and individuals create, distribute, acquire and use software and software-based services. OSS has challenged the conventional wisdom of the software engineering and software business communities, has been instrumental for educators and researchers, and has become an important aspect of e-government and information society initiatives. OSS is a complex phenomenon and requires a interdisciplinary understanding of its engineering, technical, economic, legal and socio-cultural dynamics.The goal of OSS 2010, the first IFIP WG 2.13 conference to be held in North America, is to provide an international forum where a diverse community of professionals from academia, industry and public administration can come together to share research findings and practical experiences. The conference is also meant to provide information and education to practitioners, identify directions for further research, and to be an ongoing platform for technology transfer. Additional sponsored pre- and post-conference events will include workshops, tutorials, and other special interest meetings.