The conference will be a forum to discuss theories, practices, experiences, and tools on development and applications of Open Source Systems (OSS), with specific focus on two aspects: 1) the development of open source systems and the underlying technical, social, and economics issue; 2) the adoption of OSS solutions and the implications of such adoption both in the public and in the private sector. The Conference will be held in Genoa, Italy, on July 11 – 15, 2005.