Abstract: A method of determining a readjustment value in position and/or in orientation of a stator segment of a multi segment stator of an electrical machine is provided, the stator segment to be assembled with a shaft, the method including: detecting positions of plural first reference objects attached to the stator segment using a camera system; detecting positions of plural second reference objects attached to the shaft using a laser tracking system; detecting positions of plural third reference objects attached to the camera system using the laser tracking system; determining the readjustment value in position and/or in orientation of the stator segment based on the positions of the plural first, second and third reference objects.