  Flavor asymmetry in light antiquark distributions is discussed. In
particular, recent progress on the u-bar/d-bar asymmetry is explained. Then, we
discuss possible future experimental studies.
  1. Introduction
  2. Present situation
  3. Future u-bar/d-bar asymmetry studies
  3.1 Drell-Yan process
  3.2 Charged-hadron production
  3.3 W charge asymmetry
  3.4 Deuteron acceleration at HERA
