Executive Summary of the Snowmass 2001 Working Group (P1) ``Electroweak Symmetry Breaking''

In this summary report of the 2001 Snowmass Electroweak Symmetry Breaking Working Group, the main candidates for theories of electroweak symmetry breaking are surveyed, and the criteria for distinguishing among the different approaches are discussed. The potential for observing electroweak symmetry breaking phenomena at the upgraded Tevatron and the LHC is described. We emphasize the importance of a high-luminosity $e^{+}{e}^{-}$ linear collider for precision measurements to clarify the underlying electroweak symmetry breaking dynamics. Finally, we note the possible roles of the ${\mu }^{+}{\mu }^{-}$ collider and VLHC for further elucidating the physics of electroweak symmetry breaking.