  It is generally accepted that the disturbance interpretation cannot explain
Heisenberg's uncertainty relation DxDp=h. In this paper a clear distinction
will be made between the notions of state preparation and measurement, noting
that the disturbance that is referred to in Heisenberg's disturbance
interpretation is usually caused by the measurement. The main goal of this
paper is to examine and discuss to what extent disturbance during the state
preparation plays a role in the interpretation of Heisenberg's uncertainty
relation. This examination will be done in the context of a single-slit
experiment. To conclude this paper a novel single-slit experiment will be
proposed and discussed with which a clearer insight could be gained into the
exact role of disturbance when a quantum system passes a single-slit.
