Constitutes the refereed proceedings of the 13th International Working Conference on Requirements Engineering: Foundation for Software Quality, REFSQ 2007, held in Trondheim, Norway. This book covers goal-driven requirements engineering (RE), products and product-lines, value-based RE and the value of RE, and requirements elicitation.

REFSQ 2007 International Working Conference on Requirements Engineering: Foundation for Software Quality.- Comparing Goal Modelling Languages: An Experiment.- Automatically Generating Requirements from i* Models: Experiences with a Complex Airport Operations System.- Structuring the Co-design of Requirements and Architecture.- A Template for Requirement Elicitation of Dependable Product Lines.- A Flexible Requirements Analysis Approach for Software Product Lines.- Integrated Requirement Selection and Scheduling for the Release Planning of a Software Product.- A Value-Based Approach in Requirements Engineering: Explaining Some of the Fundamental Concepts.- Value-Based Requirements Engineering for Value Webs.- A Quantitative Assessment of Requirements Engineering Publications – 1963–2006.- Handshaking Between Software Projects and Stakeholders Using Implementation Proposals.- Generating Fast Feedback in Requirements Elicitation.- Informing the Specification of a Large-Scale Socio-technical System with Models of Human Activity.- Integration Use Cases – An Applied UML Technique for Modeling Functional Requirements in Service Oriented Architecture.- Optimal-Constraint Lexicons for Requirements Specifications.- Integrating All Stages of Information Systems Development by Means of Natural Language Processing.- Information Flow Between Requirement Artifacts. Results of an Empirical Study.- Imperfect Requirements in Software Development.- Towards a Tomographic Framework for Structured Observation of Communicative Behaviour in Hospital Wards.- A Quality Performance Model for Cost-Benefit Analysis of Non-functional Requirements Applied to the Mobile Handset Domain.- Security Requirements for Civil Aviation with UML and Goal Orientation.- Challenges for RequirementsEngineering and Management in Software Product Line Development.- ElicitO: A Quality Ontology-Guided NFR Elicitation Tool.- Exploring the Characteristics of NFR Methods – A Dialogue About Two Approaches.- Defining Reference Models for Modelling Qualities: How Requirements Engineering Techniques Can Help.- Integrating an Improvement Model of Handling Capacity Requirements with the OpenUP/Basic Process.- Mal-Activity Diagrams for Capturing Attacks on Business Processes.- Towards Feature-Oriented Specification and Development with Event-B.