Expectations at day-1 at the LHC

This paper presents the status of Minimum Bias physics analysis with the ATLAS detector. The current uncertainties in modelling soft p-p inelastic interactions at $sqrt{s} = 10$TeV and $14$TeV are discussed in the context of primary charged track measurements. The selection and reconstruction of inelastic p-p interactions with the ATLAS detector at the LHC is discussed. The charged track reconstruction performance is explored using a GEANT4 simulation of the ATLAS detector. The results related to Under-lying event and di-jet production are discussed and compared to other experiments.