This book constitutes the thoroughly refereed post-conference proceedings of the 22nd International Symposium on Logic-Based Program Synthesis and Transformation, LOPSTR 2012, held in Leuven, Belgium in September 2012.

Symbolic Evaluation Graphs and Term Rewriting — A General Methodology for Analyzing Logic Programs (Abstract).- An Introduction to Search Combinators.- A Declarative Pipeline Language for Complex Data Analysis.- Semantic Code Clones in Logic Programs.- Specialization with Constrained Generalization for Software Model Checking.- Enhancing Declarative Debugging with Loop Expansion and Tree Compression.- XACML 3.0 in Answer Set Programming.- Types vs. PDGs in Information Flow Analysis- Galliwasp: A Goal-Directed Answer Set Solver.- Computing More Specific Versions of Conditional Rewriting Systems.- Improving Determinization of Grammar Programs for Program Inversion.- A Framework for Guided Test Case Generation in Constraint Logic Programming.- Simplifying the Verification of Quantified Array Assertions via Code Transformation.- Proving Properties of Co-logic Programs with Negation by Program Transformations.- Program Analysis andManipulation to Reproduce Learners’ Erroneous Reasoning.

This book constitutes the thoroughly refereed post-conference proceedings of the 22nd International Symposium on Logic-Based Program Synthesis and Transformation, LOPSTR 2012, held in Leuven, Belgium in September 2012. The 13 revised full papers presented together with 2 invited talks were carefully reviewed and selected from 27 submissions. Among the topics covered are specification, synthesis, verification, analysis, optimization, specialization, security, certification, applications and tools, program/model manipulation, and transformation techniques for any programming language paradigm.

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