Applying CNL Authoring Support to Improve Machine Translation of Forum Data -- SQUALL: A Controlled Natural Language for Querying and Updating RDF Graphs -- Answer Set Programming via Controlled Natural Language Processing -- OWL Simplified English: A Finite-State Language for Ontology Editing.-Spatiotemporal Extensions to a Controlled Natural Language.-Controlled Natural Language in Speech Recognition Based User Interfaces -- An Adaptation Technique for GF-Based Dialogue Systems -- General Architecture of a Controlled Natural Language Based Multilingual Semantic Wiki -- FrameNet Resource Grammar Library for GF.-Legislative Drafting Guidelines: How Different Are They from Controlled Language Rules for Technical Writing?.Portuguese Controlled Language: Coping with Ambiguity -- Multilingual Verbalisation of Modular Ontologies Using GF and lemon.

This book constitutes the refereed proceedings of the Third International Workshop on Controlled Natural Language, CNL 2012, held in Zurich, Switzerland,  in August 2012. The 12 revised papers presented in this volume were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on CNL for knowledge representation, CNL for interactive systems, CNL applications, CNL grammars and lexica, CNL in the context of the Semantic Web and Linked Open Data and CNL use cases.