SCOPE AND TOPICS Component-based software has emerged as a promising paradigm to deal with the ever increasing need for mastering systems' complexity, for enabling evolution and reuse, and for bringing sound production and engineering standards into software engineering. However, many issues in component-based software development remain open and pose challenging research questions. Formal methods consist of mathematically-based techniques for the specification, development and verification of software and hardware systems. They have shown their great utility for setting up the formal foundations of component software and working out challenging issues such as mathematical models for components, their composition and adaptation, or rigorous approaches to verification, deployment, testing and certification. The objective of FACS'09 is to bring together researchers in the areas of component software and formal methods to promote a deep understanding of this paradigm and its applications. The workshop will also be interested in defining the common aspects of components and component-based development. It is expected that formal paper presentations will be followed by lively discussions. Possible topics include, but are not limited to: formal models for software components and component interaction design and verification methods for component software component composition and deployment: models, calculi, languages component testing, re-engineering and reuse specification of extra-functional properties in component software certification of components and software architectures component software vs. object orientation, multi-agent systems, and aspect oriented development components for real-time, safety-critical, secure and/or embedded systems standard models for software components (e.g. Fractal, GCM, etc.) industrial or experience reports, and case studies in component software partial behavior models for software components update and reconfiguration of component architectures component systems evolution and maintenance formal methods and modeling languages for components trust models for components autonomic components and self-managed applications formal / rigorous approaches to software adaptation and self-adaptive systems formal aspects of Web services and business processes component-based Web services and service-oriented architectures QoS issues in web services, multi-agent systems and component-based systems FACS'09 is the 6th event in a series of workshops, founded by the International Institute for Software Technology of the United Nations University (UNU-IIST). The first FACS workshop was co-located with FM'03 (Pisa, Italy, September 2003). The following FACS workshops were organised as standalone events, respectively at UNU-IIST in Macau (October 2005), at Charles University in Prague (September 2006), at INRIA in Sophia-Antipolis (September 2007), and at University of Málaga in Spain (September 2008). FACS'09 is part of the first Formal Methods Week (FMweek), which will bring together a choice of events in the area, including TESTCOM/FATES (Conference on Testing of Communicating Systems and Workshop on Formal Approaches to Testing of Software), FMICS (Formal Methods for Industrial Critical Systems), PDMC (Parallel and Distributed Methods of verifiCation), FM2009 (Symposium of Formal Methods Europe), CPA (Communicating Process Architectures), FAST (Formal Aspects in Security and Trust), FMCO (Formal Methods for Components and Objects), and the REFINE Workshop. For the latest information on FMweek, see http://www.win.tue.nl/fmweek.