Abstract
Building on the success of the first three workshops in the series, which were held at ICSE 2001 (Toronto), ICSE 2002 (Orlando) and ICSE 2003 (Portland), the 4th Workshop on Open Source Software Engineering, ("Collaboration, Conflict and Control") brings together researchers and practitioners for the purpose of discussing the platforms and tools, techniques and processes, and the organizational structures that are used to support and sustain communication, collaboration and conflict resolution within and between open source software communities.