 The two postulates are not in contradiction with each other because when new information is gathered some previous relevant information becomes irrelevant. “Relevant” here means that it affects future probabilities. A moment of reflection shows that first postulate implies the characteristic discreteness of quantum theory, the second implies Heisenberg’s uncertainties. Very similar postulates were independently proposed by Zeilinger and Bruckner (Zeilinger 1999; Brukner &amp; Zeilinger 2003).