  This volume constitutes the pre-proceedings of the 28th International
Symposium on Logic-Based Program Synthesis and Transformation (LOPSTR 2018),
held on 4-6th September 2018 in Frankfurt am Main, Germany and co-located with
the 20th International Symposium on Principles and Practice of Declarative
Programming (PPDP 2018) and the 26th International Workshop on Functional and
Logic Programming (WFLP 2018).
