This book constitutes the thoroughly refereed post-proceedings of the 15th International Symposium on Logic Based Program Synthesis and Transformation, LOPSTR 2005, held in September 2005. The 10 revised full papers presented together with one invited talk were carefully selected and revised from 33 submissions. The papers are organized in topical sections on tools for program development, program transformations, and software development and program analysis.

This volume contains the proceedings of the 25th International Conference on Logic Programming (ICLP 2009). The conference took place in Pasadena, Ca- fornia during July 14-17, 2009. The ICLP series of conferences is aimed at p- viding a technical forum for presenting and disseminating innovative research results in the ?eld of logic programming. Theconference, whichwasco-locatedwiththeInternationalJointConference on Arti?cial Intelligence (IJCAI), featured technical presentations, tutorials, - vited talks, and a number of special events, including: - The 5th ICLP Doctoral Student Consortium...