The ILC Technical Design Report documents the design of a 500 GeV linear collider, but does not specify the centre-of-mass energy steps of operation for the collider. The ILC Parameters Joint Working Group has studied possible running scenarios and the evolution of physics outcomes based on a realistic estimate of the real time accumulation of integrated luminosity, including initial operations ramp-up and upgrades, constrained by a realistic power budget. These physics goals include Higgs precision measurements, top quark measurements and searches for new physics. We present this "optimized" operating scenario and the anticipated evolution of the precision of the ILC measurements.