We discuss simple considerations for particle identification in the Hall D detector. The main issue here is K/pi separation for momenta up to around 5GeV/c. We argue that the correct approach for Phase 1 is a threshold, heavy gas Cerenkov detector, augmented by a time-of-flight hodoscope wall, just upstream of the LGD. The HERMES system of a single radiator (aerogel plus gas) and imaging optics is also discussed.
