Abstracts of the Keynotes -- Expanding the Scope of Software Product Families: Problems and Alternative Approaches -- Composing with Style – Components Meet Architecture -- Abstracts of the Tutorials -- Documentation Principles and Practices That You Can Live with -- Model-Based Software Development with Eclipse -- Software Architecture Analysis and Evaluation -- Architecture Evaluation: Selecting Alternatives -- MEMS: A Method for Evaluating Middleware Architectures -- Evaluating Alternative COTS Assemblies from Imperfect Component Information -- Managing and Applying Architectural Knowledge -- Building Up and Reasoning About Architectural Knowledge -- Managing Architectural Design Decisions for Safety-Critical Software Systems -- Architectural Evaluation: Performance Prediction -- Runtime Prediction of Queued Behaviour -- Model Transformation in Software Performance Engineering -- Processes for Supporting Architecture Quality -- Traveling Architects – A New Way of Herding Cats -- A Practical Architecture-Centric Analysis Process -- Models for Architecture Evaluation -- Embedded Systems Architecture: Evaluation and Analysis -- Parameter Dependent Performance Specifications of Software Components -- Architectural Evaluation -- Applying the ATAM to an Architecture for Decentralized Control of a Transportation System -- Towards an Integration of Standard Component-Based Safety Evaluation Techniques with SaveCCM.

This book constitutes the thoroughly refereed post-proceedings of the Second International Conference on the Quality of Software Architectures, QoSA 2006, held in Västerås, Sweden in June 2006, co-located with the 9th International Symposium on Component-Based Software Engineering, CBSE 2006. The 12 revised full papers presented together with the abstracts of 2 keynote talks and 3 tutorials were carefully reviewed and selected from 30 submissions. The papers are organized in topical sections on architecture evaluation: selecting alternatives, managing and applying architectural knowledge, architectural evaluation: performance prediction, processes for supporting architecture quality, models for architecture evaluation, and architectural evaluation.