On the Determination of $\mathrm{\mid }{V}_{ub}\mathrm{\mid }$ from Inclusive Semileptonic Decay Spectra

We propose a model independent method to determine $\mathrm{\mid }{V}_{ub}\mathrm{\mid }$ from the energy spectrum of the charged lepton in inclusive semileptonic $B$ decays. The method includes perturbative QCD corrections as well as nonperturbative ones.