An Introduction to Requirements Knowledge.- Unpacking Tacit Knowledge for Requirements Engineering.- Mining Requirements Knowledge from Operational Experience.- DUFICE: Guidelines for a Lightweight Management of Requirements Knowledge.- Constructing and Using Software Requirements Patterns.- Using Ontologies and Machine Learning for Hazard Identification and Safety Analysis.- Knowledge-Assisted Ontology-Based Requirements Evolution.- Reusing Requirements in Global Software Engineering.- Performative and Lexical Knowledge Sharing in Agile Requirements.- Using Web 2.0 for Stakeholder Analysis: StakeSource and its Application in Ten Industrial Projects.- Resolving Inconsistency and Incompleteness Issues in Software Requirements.- Automated Verification of Variability Model Using First Order Logic.- Model-based Requirements Engineering Framework for Systems Lifecycle Support.- An Overview of Recommender Systems in Requirements Engineering.- Experience based Requirements Engineering Tools.- The Eclipse Requirements Modeling Framework.- Managing Requirements Knowledge: Conclusion and Outlook.