  This study showcases the approaches towards lepton identification and $\gamma
\gamma$ mitigation at center-of-mass energy $\sqrt{s} = 500$ GeV for
semileptonic WW decays at the ILC. The analysis is performed using fully
simulated Standard Model Monte Carlo events with the ILD detector concept and
emphasizes the measurement of the W mass. The mass measurement is performed
through the identification of a lepton and treatment of the remaining system as
the hadronic W-boson. Only the most favorable beam polarization scenario for WW
production is considered. The resulting detector performance benchmark
obtained, with an integrated luminosity of $1600$ fb$^{-1}$ , is a statistical
error on the W mass of $\Delta M_{W}$ (stat.)$ = 2.4$ MeV and a relative
statistical error on the WW crosssection of $\Delta \sigma/\sigma$(stat.)$ =
0.036\%$.
