The basic concepts of factorizable problems in one-dimensional Quantum Mech
anics, as well as the theory of Shape Invariant potentials are reviewed. Th
e relation of this last theory with a generalization of the classical Facto
rization Method presented by Infeld and Hull is analyzed in detail. By the
use of some properties of the Riccati equation the solutions of Infeld and
Hull are generalized in a simple way.