Abstract: A method for assembling a vehicle body entails that body components are moved to predetermined positions in relation to one another and joined together. A first body component is placed in a first retainer device which is moved by a first industrial robot to a stationary fixing device where it is positionally fixed. A further body component is moved correspondingly to the fixing device. The two body components are joined together by means of a joining device which is carried by an industrial robot. An assembly plant for assembling a vehicle body on the basis of a number of body components includes a number of manipulators and a control system. The manipulators have means (26, 29) for displacing, positioning, positionally fixing and joining together the body components. The control system has at least one program module and a plurality of processors. The plant has a stationary positioning and fixing device with coupling members (26) for cooperation with coupling members on a retainer device.