  Studies of fully-reconstructed jets in heavy-ion collisions aim at extracting
thermodynamical and transport properties of hot and dense QCD matter. Recently,
a plethora of new jet substructure observables have been theoretically and
experimentally developed that provide novel precise insights on the
modifications of the parton radiation pattern induced by a QCD medium. This
report, summarizing the main lines of discussion at the 5th Heavy Ion Jet
Workshop and CERN TH institute "Novel tools and observables for jet physics in
heavy-ion collisions" in 2017, presents a first attempt at outlining a strategy
for isolating and identifying the relevant physical processes that are
responsible for the observed medium-induced jet modifications. These studies
combine theory insights, based on the Lund parton splitting map, with
sophisticated jet reconstruction techniques, including grooming and background
subtraction algorithms.
