1 Variability-intensive Software Systems: Concepts and Techniques MATTHIAS GALSTER, IVAN MISTRIK, BRUCE MAXIMPart I CONCEPTS AND MODELS2 Observations from Variability Modelling Approaches at the Architecture Level ANA PAULA ALLIAN, RAFAEL CAPILLA, AND ELISA YUMI NAKAGAWA3 Context Modelling for Variability-intensive Systems During Requirements Engineering NELUFAR ULFAT-BUNYADI AND MARITTA HEISEL4 Variability Incorporated Simultaneous Decomposition of Models UnderStructural and Procedural Views MUHAMMED CAGRI KAYA, SELMA SULOGLU, GUL TOKDEMIR, BEDIR TEKINERDOGAN, AND ALI H. DOGRUPart II ANALYZING AND EVALUAT ING5 Towards Self-securing Software Systems: Variability Spectrum MOHAMED ABDELRAZEK, JOHN GRUNDY, AND AMANI IBRAHIM6 The Emerging Role of the Ecosystems Architect JAMES HEDGES AND ANDREI FURDA7 Features and How to Find Them: A Survey of Manual Feature Location JACOB KRÜGER, THORSTEN BERGER, AND THOMAS LEICH8 A Debt-Aware Software Product Lines Engineering Using Portfolio Theory JASMINE LEE AND RAMI BAHSOON9 Realising Variability in Dynamic Software Product Lines JANE D. A. SANDIM ELEUTÉRIO, BRENO B. N. DE FRANÇA, CECILIA M. F. RUBIRA, AND ROGÉRIO DE LEMOSPart III TECHNOLOGIES, EXPERIMENTS, AND STUDIES10 A Feature Ontology to Power Enterprise-Level Product Line Engineering CHARLES KRUEGER AND PAUL CLEMENTS11 Design of Variable Big Data Architectures for E-Government Domain BEDIR TEKINERDOGAN AND BURAK UZUN12 Refactoring Support for Variability-intensive Systems VAHID ALIZADEH, MAROUANE KESSENTINI, AND BRUCE R. MAXIM13 Variability in Library Evolution: An Exploratory Study on Open-Source Java Libraries HUSSEIN ALRUBAYE, MOHAMED WIEM MKAOUER, AND ANTHONY PERUMA14 Evolving Variability Requirements of IoT SystemsLUIS CHUMPITAZ, ANDREI FURDA, AND SENG LOKE15 Outlook and Future Directions BRUCE MAXIM, MATTHIAS GALSTER, AND IVAN MISTRIK