Abstract: A computer implemented method for planning an object which comprises a multitude of single parts and subassemblies, especially an aerospace object, the method comprising: calculating the total weights of the subassemblies and/or of the object on the basis of the data sets of the single parts and the subassemblies, wherein measured weights are used preferably to calculated weights, and calculated weights are used preferably to target weights for the calculation of the total weight(s) of the subassemblies and/or of the object, and calculating and providing the information about the shares of the used weight types in the calculated total weights. The invention further also relates to a manufacturing system and a computer implemented construction module.