This book constitutes the thoroughly refereed
post-conference proceedings of the 25th International Symposium on Logic-Based
Program Synthesis and Transformation, LOPSTR 2015, held in Siena, Italy, in
July 2015.

The 21 revised full papers presented together with 3
invited talks were carefully reviewed and selected from 30 submissions. The aim
of the LOPSTR series is to stimulate and promote international research and
collaboration on logic-based program development. LOPSTR is open to
contributions in all aspects of logic-based program development, all stages of
the software life cycle, and issues of both programming-in-the-small and
programming-in-the-large.