  The performance of the missing transverse momentum (E$_{T}^{miss}$)
reconstruction with the ATLAS detector is evaluated using data collected in
proton-proton collisions at the LHC at a center-of-mass energy of 13 TeV in
2015. To reconstruct E$_{T}^{miss}$, fully calibrated electrons, muons,
photons, hadronically decaying $\tau$-leptons, and jets reconstructed from
calorimeter energy deposits and charged-particle tracks are used. These are
combined with the soft hadronic activity measured by reconstructed
charged-particle tracks not associated with the hard objects. Possible double
counting of contributions from reconstructed charged-particle tracks from the
inner detector, energy deposits in the calorimeter, and reconstructed muons
from the muon spectrometer is avoided by applying a signal ambiguity resolution
procedure which rejects already used signals when combining the various
E$_{T}^{miss}$ contributions. The individual terms as well as the overall
reconstructed E$_{T}^{miss}$ are evaluated with various performance metrics for
scale (linearity), resolution, and sensitivity to the data-taking conditions.
The method developed to determine the systematic uncertainties of the
E$_{T}^{miss}$ scale and resolution is discussed. Results are shown based on
the full 2015 data sample corresponding to an integrated luminosity of 3.2
fb$^{-1}$.
