The invention relates to a method for rating the quality of a computer program whose execution involves an integrated circuit's input data and output data being influenced, comprising (a) provision of a mutated integrated circuit which is obtained by incorporating one or more functional mutations into the (unmutated) integrated circuit; (b) influencing of the mutated integrated circuit's input data and output data, with the output data from the mutated integrated circuit being recorded; (c) comparison of the output data obtained in this manner from the mutated integrated circuit with the output data which the computer program expects when the unmutated integrated circuit is influenced; and (d) rating of the quality of the computer program on the basis of the comparison results.