  We review recent work that employs the framework of logical inference to
establish a bridge between data gathered through experiments and their
objective description in terms of human-made concepts. It is shown that logical
inference applied to experiments for which the observed events are independent
and for which the frequency distribution of these events is robust with respect
to small changes of the conditions under which experiments are carried out
yields, without introducing any concept of quantum theory, the quantum
theoretical description in terms of the Schr\"odinger or the Pauli equation,
the Stern-Gerlach or Einstein-Podolsky-Rosen-Bohm experiments. The
extraordinary descriptive power of quantum theory then follows from the fact
that it is plausible reasoning, that is common sense, applied to reproducible
and robust experimental data.
