Steps in the philosophy of quantum theory

1. Interpretation. The Copenhagen Interpretation (CI) is a minimal semantics to quantum theory, expressing what we know at least. It can be extended into a universal Quantum Theory, applied to the observer as well as to the observed object. 2. A Universal Theory as a Philosophical Problem. A circular epistemology is proposed, consisting of non-hierarchical realism, empirism, apriorism and evolutionism, combined in a description of time: past as discrete facts, future as continuous possibilities. 3. Quantum Logic and the Reconstruction of Quantum Theory. Non-distributive logic and Bell's theorem are discussed following Doebner and Luecke. Reconstruction is briefly described. 4. Further Philosophical Questions. Mind-body problem and holism are briefly discussed. (orig.)