Controlling vectors: Do we need normal or post-normal science?

Abstract

Is there just one science, the one we have, the given? Or on the contrary, are there several possible sciences? In the later case: which are their differences? Are they compatible? Complementary? Opposite? I will try to persuade the audience that at least three sciences can be distinguished: original blend, techno-science (normal science) and science of the postnormal age (call it transcendent science as it needs to go outside its field into the realm of decision making). I will distinguish the three at the epistemological level (arguably the deepest level) so that it may happen that what is scientific knowledge for one is not so for another.