  This volume contains the proceedings of the 13th International Colloquium on
Implementation of Constraint and LOgic Programming Systems (CICLOPS 2013), held
in Istanbul, Turkey during August 25, 2013. CICLOPS is a well established line
of workshops, traditionally co-located with ICLP, that aims at discussing and
exchanging experience on the design, implementation, and optimization of
constraint and logic programming systems, and other systems based on logic as a
means of expressing computations. This year, CICLOPS received 8 paper
submissions. Each submission was reviewed by at least 3 Program Committee
members and, at the end, 6 papers were accepted for presentation at the
workshop. We would like to thank the ICLP organizers for their support, the
EasyChair conference management system for making the life of the program
chairs easier and arxiv.org for providing permanent hosting. Thanks should go
also to the authors of all submitted papers for their contribution to make
CICLOPS alive and to the participants for making the event a meeting point for
a fruitful exchange of ideas and feedback on recent developments. Finally, we
want to express our gratitude to the Program Committee members, as the
symposium would not have been possible without their dedicated work.
