This book contains the proceedings of the 5th International Workshop on Product Family Engineering, PFE-5. This workshop was held in Siena, Italy, November 4-6, 2003. This workshop was the fifth in the series, with the same subject, software product family engineering. These workshops have been held initially irregularly about every 18 months since 1996. Since 1999 the workshop has been held every second year in the fall. The proceedings of the second, third and fourth workshops were published as Springer LNCS volumes 1429, 1951 and 2290. The workshops were organized within co-operation projects of European industry. The first two were organized by ARES (Esprit IV 20.477) 1995-1999; this project had 3 industrial and 3 academic partners, and studied software architectures for product families. Some of the partners continued in the ITEA project if99005 ESAPS (1999-2001). ITEA is the software development programme (?! 2023) within the European Eureka initiative. ITEA projects last for 2 years, and ESAPS was succeeded by CAFÉ (ITEA if00004) for 2001-2003 and FAMILIES (ITEA if02009). This fifth workshop was initially prepared within CAFÉ and the preparation continued in FAMILIES. As usual Henk Obbink was the workshop chair, and Linda Northrop and Sergio Bandinelli were the co-chairs.

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Research Topics and Future Trends.- Research Topics and Future Trends.- Key Notes.- Testing Variabilities in Use Case Models.- Exploring the Context of Product Line Adoption.- A Quantitative Model of the Value of Architecture in Product Line Adoption.- Variation Mechanisms.- Multi-view Variation Modeling for Scenario Analysis.- A Meta-model for Representing Variability in Product Family Development.- Variability Dependencies in Product Family Engineering.- Managing Component Variability within Embedded Software Product Lines via Transformational Code Generation.- Evolving a Product Family in a Changing Context.- Towards a UML Profile for Software Product Lines.- Requirements Analysis and Management.- Applying System Families Concepts to Requirements Engineering Process Definition.- Elicitation of Use Cases for Product Lines.- RequiLine: A Requirements Engineering Tool for Software Product Lines.- PLUTO: A Test Methodology for Product Families.- A Requirement-Based Approach to Test Product Families.- Theorem Proving for Product Line Model Verification.- Product Derivation.- A Koala-Based Approach for Modelling and Deploying Configurable Software Product Families.- Feature Binding Analysis for Product Line Component Development.- Patterns in Product Family Architecture Design.- Differencing and Merging within an Evolving Product Line Architecture.- A Relational Architecture Description Language for Software Families.- Transition to Family Development.- Planning and Managing Product Line Evolution.- A Cost Model for Software Product Lines.- Salion's Experience with a Reactive Software Product Line Approach.- Towards a Taxonomy for Software Product Lines.- Architecture Recovery for Product Families.- Industrial Experience.- Software Product Family Evaluation.- Design for Quality.- Economics of Software Product Lines.- A Case Study of Two Configurable Software Product Families.- Software Architecture Helpdesk.- Evolution.- Different Aspects of Product Family Adoption.- Dynamic Software Reconfiguration in Software Product Families.- Architecture True Prototyping of Product Lines Using Personal Computer Networks.- Decisions and Derivation.- Making Variability Decisions during Architecture Design.- Decision Model and Flexible Component Definition Based on XML Technology.- A Product Derivation Framework for Software Product Families.