  There exist dozens of interpretations of quantum theory, but they do not seem
to contribute much to understanding the theory. This paper attempts to clarify
some issues that are discussed in those interpretations. The main keywords are:
"Classical ontology", Indeterminism, Probability, Predictions, The necessity of
classical concepts, Minimal interpretation, Lattice, Physical objects,
Alternatives to quantum theory?, Measurement, Realism. One of the main points
of this paper is the role of predictions in understanding any theory of
physics.
