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We analyze two consequences of the relationship between collinearfactorization and $k_t$-factorization. First, we show that the$k_t$-factorization gives a fundamental justification for the choice of thehard scale $Q^2$ done in the collinear factorization. Second, we show that inthe collinear factorization there is an uncertainty on this choice which willnot be reduced by higher orders. This uncertainty is absent within the$k_t$-factorization formalism.

Hard scale uncertainty in collinear factorization: Perspective from $k_t$-factorization