Provided is a method for determining at least one region in at least one input model for at least one element to be placed including the steps: receiving an input data set including the at least one element to be placed, a plurality of conditions; the at least one input model; determining at least one appurtenant condition from the plurality of conditions; and determining at least one valid and/or invalid region of the at least one input model depending on the appurtenant condition; wherein the at least one valid region satisfies the appurtenant condition at least in part.