  The modelling of minimum bias interactions is a crucial ingredient to learn
about the description of soft QCD processes. It has also a significant
relevance for the simulation of the environment at the LHC with many concurrent
pp interactions (pileup). The ATLAS collaboration has provided new measurements
of the inclusive charged-particle multiplicity and its dependence on transverse
momentum and pseudorapidity in special data sets with low LHC beam currents,
recorded at center of mass energies of 8 TeV and 13 TeV. The measurements use
charged-particle selections with minimum transverse momentum of both 100 MeV
and 500 MeV, and various phase-space regions characterized by low and high
charged-particle multiplicities.
