Cosmology with galaxy clusters: impact of theoretical and observational
  systematic uncertainties
  In this talk I focus on how the modelling of the mass-observable relation and
the halo mass function can impact the accuracy and precision of cosmological
constraints inferred from galaxy clusters. I present a new analysis of clusters
detected in mm wavelengths by the Planck satellite, highlighting the need of an
improved description and calibration for the mass-observable relation.
