Reconstruction of the jet hadronic energy scale in the ATLAS calorimeter system

The precision of the final jet energy scale is a fundamental ingredient for important physics measurements, like the top-quark mass, or even for new discoveries (SUSY). The ATLAS calorimeter requirements in terms of uniformity and resolution have been achieved and verified in many years of tests on beam at CERN. y issues for the jet reconstruction and calibration in ATLAS (agreement between test beam data and the Geant 4 predictions, clustering strategies, reconstruction and calibration algorithms) will be briefly discussed and reviewed.