  Uncertainty Quantification (UQ) is vital to safety-critical model-based
analyses, but the widespread adoption of sophisticated UQ methods is limited by
technical complexity. In this paper, we introduce UM-Bridge (the UQ and
Modeling Bridge), a high-level abstraction and software protocol that
facilitates universal interoperability of UQ software with simulation codes. It
breaks down the technical complexity of advanced UQ applications and enables
separation of concerns between experts. UM-Bridge democratizes UQ by allowing
effective interdisciplinary collaboration, accelerating the development of
advanced UQ methods, and making it easy to perform UQ analyses from prototype
to High Performance Computing (HPC) scale.
  In addition, we present a library of ready-to-run UQ benchmark problems, all
easily accessible through UM-Bridge. These benchmarks support UQ methodology
research, enabling reproducible performance comparisons. We demonstrate
UM-Bridge with several scientific applications, harnessing HPC resources even
using UQ codes not designed with HPC support.
