Much of a software architect's life is spent designing software systems to meet a set of quality requirements. General software quality attributes include scalability, security, performance or reliability. Quality attribute requirements are part of an application's non-functional requirements, which capture the many facets of how the functional - quirements of an application are achieved. Understanding, modeling and continually evaluating quality attributes throughout a project lifecycle are all complex engineering tasks whichcontinuetochallengethe softwareengineeringscienti ccommunity. While we search for improved approaches, methods, formalisms and tools that are usable in practice and can scale to large systems, the complexity of the applications that the so- ware industry is challenged to build is ever increasing. Thus, as a research community, there is little opportunity for us to rest on our laurels, as our innovations that address new aspects of system complexity must be deployed and validated. To this end the 5th International Conference on the Quality of Software Archit- tures (QoSA) 2009 focused on architectures for adaptive software systems. Modern software systems must often recon guretheir structure and behavior to respond to c- tinuous changes in requirements and in their execution environment. In these settings, quality models are helpful at an architectural level to guide systematic model-driven software development strategies by evaluating the impact of competing architectural choices.

This book constitutes the refereed proceedings of the tracks and workshops which complemented the 15th European Conference on Software Architecture, ECSA 2021, held in Vaxjoe, Sweden*, in September 2021. The 15 full papers presented in this volume were carefully reviewed and selected from 17 submissions. Papers presented were accepted into the following tracks and workshops: Industry Track; DE&I - Diversity, Equity and Inclusion Track; SAEroCon - 8th Workshop on Software Architecture Erosion and Architectural Consistency; MSR4SA - 1st International Workshop on Mining Software Repositories for Software Architecture; SAML - 1st International Workshop on Software Architecture and Machine Learning; CASA - 4th Context-aware, Autonomous and Smart Architectures International Workshop; FAACS - 5th International Workshop on Formal Approaches for Advanced Computing Systems; MDE4SA - 2nd International Workshop on Model-Driven Engineering for Software Architecture; Tools and Demonstrations Track; Tutorial Track. *The conference was held virtually due to the COVID-19 pandemic.

This book constitutes the refereed proceedings of the 15th International Conference on Software Architecture, ECSA 2021, held in Sweden, in September 2021. Due to the COVID-19 pandemic, the conference was held virtually. For the Research Track, 11 full papers, presented together with 5 short papers, were carefully reviewed and selected from 58 submissions. The papers are organized in topical sections as follows: architectures for reconfigurable and self-adaptive systems; machine learning for software architecture; architectural knowledge, decisions, and rationale; architecting for quality attributes; architecture-centric source code analysis; and experiences and learnings from industrial case studies.

Severalconferenceand workshopseriesarededicated to formalcomponent m- els and their use in veri?cation and quality prediction, such as FMCO, CBSE, FESCA, FACS andQoSA. There are a plethoraof componentmodels published, all with speci?c merits and bene?ts. However, most often these models are not used for comparison, as each research group concentrates on di?erent aspects of formal component modelling and quality prediction. Like the famous pro- 1 duction cell approach of the FZI, Karlsruhe, which has served since 1995 as a common example for di?erent embedded systems safety veri?cation, in this v- ume we de?ne a commonexample for modelling approachesof component-based systems. This Common Component Modelling Example enables the compa- bility of di?erent approaches, the validation of existing models, a better focus of research to tackle aspects less frequently dealt within the classi?cation of - isting models and approaches, an eased interchange of research ideas, as well as a simpli?ed and increased coordination and research collaborations to join complementary models and approaches. In this volume we de?ne the Common Component Modelling Example and present the models in current modelling and analysis approaches. The book concludes with comments on each modelling approach by an international jury. August 2007 Andreas Rausch Ralf Reussner Ra?aela Mirandola Franti? sek Pl a? sil 1 Springer LNCS vol. 891. Organization The Dagstuhl research seminar for CoCoME (Common Component Modelling Example)modellingcontestispartofaseriesofseminarsorganizedwithsupport by the German Computer Science Society (Gesellschaft fu ]r Informatik, GI). It was held during August 1-3, 2007 at Schloss Dagstuhl, Germany, as event number 07312."