  The measurement of the mass of the W boson, m_W, by direct reconstruction is
described. The combination of all measurements of the four LEP experiments
yields m_W = 80.412 +- 0.042 GeV. Together with several other measurements the
extracted m_W value enters the electroweak fit, which tests the Standard Model
(SM) predictions and extracts SM parameters which have not yet been measured.
The latest results of the fit are presented.
