W Boson Properties

Studying the properties of the W boson naturally plays a key role in precision tests of the Standard Model. In this paper, the key measurements performed at LEP and the Tevatron over the last decade are reviewed. The current world knowledge of the W boson production and decay properties, gauge couplings, and mass are presented, with an emphasis on the most recent results from LEP2. Some estimates of the sensitivity of the upcoming Tevatron RunII are also presented.