  The term "measurement" in quantum theory (as well as in other physical
theories) is ambiguous: It is used to describe both an experience - e.g., an
observation in an experiment - and an interaction with the system under
scrutiny. If doing physics is regarded as a creative activity to develop a
meaningful description of the world, then one has to carefully discriminate
between the two notions: An observer's account of experience - consitutive to
meaning - is hardly expressed exhaustively by the formal framework of an
interaction within one particular theory. We develop a corresponding
perspective onto central terms in quantum mechanics in general, and onto the
measurement problem in particular.
