  The high-energy scattering of massive electroweak bosons, known as vector
boson scattering (VBS), is a sensitive probe of new physics. VBS signatures
will be thoroughly and systematically investigated at the LHC with the large
data samples available and those that will be collected in the near future.
Searches for deviations from Standard Model (SM) expectations in VBS facilitate
tests of the Electroweak Symmetry Breaking (EWSB) mechanism. Current
state-of-the-art tools and theory developments, together with the latest
experimental results, and the studies foreseen for the near future are
summarized. A review of the existing Beyond the SM (BSM) models that could be
tested with such studies as well as data analysis strategies to understand the
interplay between models and the effective field theory paradigm for
interpreting experimental results are discussed. This document is a summary of
the EU COST network "VBScan" workshop on the sensitivity of VBS processes for
BSM frameworks that took place December 4-5, 2019 at the LIP facilities in
Lisbon, Portugal. In this manuscript we outline the scope of the workshop,
summarize the different contributions from theory and experiment, and discuss
the relevant findings.
