The fact that both methodologies have not been extensively dealt with in Spain Catalá and Yepes, 1999; Cavero et al, 2003 contributes with a novel factor to the model being addressed herein.
El hecho de que ambas metodologías hayan sido tratadas en España únicamente de forma básica Catalá y Yepes, 1999; Cavero et al., 2003 aporta un factor novedoso al modelo que nos ocupa.