A method for monitoring a coordinate-measuring machine (CMM), having a monitoring device which is set up to monitor at least one location region of the CMM, in which a movable part of the CMM is movable, wherein the method includes: monitoring the at least one location region with the monitoring device, wherein the monitored location region is variable in terms of its size, ascertaining the position of the movable part of the CMM relative to a fixed position associated with the location region and/or ascertaining the movement of the movable part relative to the fixed position, and setting or varying the size of the monitored location region in dependence on the position and/or the movement of the movable part relative to the fixed position.