2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45604We discuss the evolution of F_2^p at small x, emphasizing the uncertainties related to expansion, fitting, renormalization and factorization scheme dependence. We find that perturbative extrapolation from the measured region down to smaller x and lower Q^2 may become strongly scheme dependent.8 pages, LaTeX with epsfig, 2 uuencoded figuresHigh Energy Physics - Phenomenologytext