Constraints -- Constraint Solving on Hybrid Systems -- Run-time Analysis of Temporal Constrained Objects -- Implementation of Logical Retraction in Constraint Handling Rules with Justifications -- The Proportional Constraint and Its Pruning -- An Operational Semantics for Constraint-logic Imperative Programming -- Hypertree Decomposition: The First Step Towards Parallel Constraint Solving -- Declarative Systems -- Declarative Aspects in Explicative Data Mining for Computational Sensemaking -- An Approach for Representing Answer Sets in Natural Language -- Techniques for Efficient Lazy-Grounding ASP Solving -- Reasoning Principles and Heurstic Strategies in Modeling Human Clusters -- Functional and Logic Programming -- Concolic Testing of Functional Logic Programs -- Declarative XML Schema Validation with SWI-Prolog -- plspec - A Specification Language for Prolog Data.