This book constitutes the refereed proceedings of the 9th International Symposium on
Search-Based Software Engineering SSBSE 2017 held in Paderborn Germany in September 2017.
The 7 full papers and 5 short papers presented together with 4 challenge track and 2 students
student track papers were carefully reviewed and selected from 26 submissions. SSBSE welcomes
not only applications from throughout the software engineering lifecycle but also a broad range
of search methods ranging from exact Operational Research techniques to nature-inspired
algorithms and simulated annealing.
