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\section{Muon Combined Performance}

\par
The muon spectrometer is designed to operate as a standalone instrument 
for some two muon and four muon final state processes. Overall 
ATLAS muon identification, momentum meaurement and physics reach is 
enhanced when the spectrometer  data are analyzed  in combination with
the inner detector and calorimetry.  For example, the identification and 
measurement of low $P_t$ muons  from J/psi decays is possible via the 
inner tracker track reconstruction for momentum measurement combined with the 
muon spectrometer for  triggering and particle identification. Semileptonic final 
states (eg, $W \rightarrow$ \mu \nu) can only be detected via a combined analysis. 

\par Recently Daniel Levin has been appointed as co-convener of the ATLAS
combined muon performance working group. The primary objectives of this group will be to 
refine the combined detector analysis methods, define the cuts and understand 
the resultant efficiencies. 
\par
The task of efficient identification and measurement of muons in ATLAS 
will require detailed analysis from multiple subsystems. To best understand
susbsystem alignment, gaps, the impact of a complicated mass distribution on muon measurement, 
inefficiencies and ultimately be able to parley this knowledge 
into the discovery of new physics must be done using a combine detector approach. 
The methods and cuts that define an ATLAS muon can only be made after 
extensive simulations, and once the LHC is running,  from analysis of standard 
candle processes with known cross sections.  

\par Towards this end Dan is assembling a core group of people to study specific 
signature muon final state benchmarks such as Z and W decays. The abundance of W,Z 
boson generation in  ATLAS enables a detailed  tomography of the ATLAS detector and 
understanding of  detector artifacts such as energy losses, identification efficiency, 
the impact  of muon isolation requirements, alignment and momentum calibration.
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