Reproducibility is foundational to science and engineering: the ability to apply experimental methods that produce consistent results enables us to understand our own work, build on each other's work, and have high confidence in the body of scientific literature. The study of reproducibility is a discipline in its own right, and ACM REP is a venue for work that contributes to our understanding and practices of reproducibility and replicability in computer science, as well as other fields that depend on computing.