This book constitutes the refereed proceedings of the 9th International Symposium on Component-Based Software Engineering, CBSE 2006, held in V?ster?s, Sweden in June/July 2006.

The 22 revised full papers and 9 revised short papers presented were carefully reviewed and selected from 77 submissions. The papers cover all issues concerned with the development of software-intensive systems from reusable parts, the development of reusable parts, and system maintenance and improvement by means of component replacement and customization. Topics addressed are architecture and design of component-based systems, components for real-time and embedded systems, combination of component-based with aspect-oriented software development, extra-functional system properties of components and component-based systems, components at work, and measurement and prediction models for component assemblies.