Product innovation success has very much to do with the development of models ormetaphors that are able to guide actors. One can observe two traditions in thisregard: rational and non-rational models. Apparently in the former the model, suchas “development funnel”, is regarded as a mechanism and rigid applicable, picturinginnovation as an orderly, goal-oriented, value-neutral, and systematic pr...

Let S be a rational projective surface given by means of parametrization whose base locus satisfies mild assumption. In this paper we present an algorithm that provides three maps f,g,h:A2⇢S⊂Pn such the union images covers S. As consequence, second generates two f,g˜:A2⇢S, its affine S∩An. case, number involved in cover is general optimal.