2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41910I briefly review the description of inclusive heavy hadron decays based on the inverse heavy quark mass expansion. In particular, I consider the transition $B \to X_u \ell ν$ and the problem of extracting $V_{ub}$, mainly as far as the separation from the background represented by $b \to c$ modes is concerned. I also discuss how to obtain complementary information from the decay mode $B \to X_s γ$.LaTeX, 4 pages. Invited talk at the meeting "IFAE - Parma 2002", April 3-5, 2002, Parma, ItalyHigh Energy Physics - Phenomenologytext