The margin of error defines the minimum change of a given figure that the LFS has to show before we can be quite certain that there has been an actual change. With an unemployment level of around 120 000, we need a change of about +/- 13 000 before we can be quite certain that there has been an actual change. Likewise, we must have a change of about +/- 18 000 persons assuming an employment level of around 2 650 000.