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Then, from a theoretician's point of view, I review (a) past history, (b) present trials, and (c) possible future alternatives on measuring |V_ub| and/or |V_ub/V_cb|. As of my main topic, I introduce a model-independent method, which predicts \\Gamma(B -> X_u l \\nu) / \\Gamma(B -> X_c l \\nu) \\equiv (\\gamma_u / \\gamma_c) \\times | V_{ub} / V_{cb}|^2 \\simeq (1.83 \\pm 0.28) \\times |V_ub / V_cb|^2 and |V_ub/V_cb| \\equiv (\\gamma_c / \\gamma_u)^{1/2} \\times [{\\cal{B}}(B -> X_u l \\nu)/{\\cal{B}}(B -> X_c l \\nu)]^{1/2} \\simeq (0.74 \\pm 0.06) \\ti","authors_text":"C. S. 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