A method for transforming recorded communication data by means of a first program, the communication data being given by messages from a network or bus communication, the recorded communication having been carried out on the basis of a first communication matrix, the recorded communication data being intended to be sent to a control device under test by means of a test system, the test system being connected to the control device under test via a first communication link, the control device under test being configured based on a second communication matrix, the method comprising the following method steps: a) reading in the first and second communication matrix (CM1, CM2), b) comparing the elements (E1, E2, E3, E4, E1', E2', E3', E5') of the communication matrices (CM1, CM2) by i) assigning identical or corresponding elements (E1, E2, E3, E1', E2', E3') in each case, and ii) categorizing changes in the elements (E1', E2', E3', E5') of the second communication matrix relative to the elements (E1, E2, E3, E4) of the first communication matrix, c) determining the data to be transformed, the data to be transformed being given by such communication data able to be associated with an element of the first communication matrix corresponding to an element (E3') of the second communication matrix, the element (E3') of the second communication matrix comprising categorized changes (Kat1.3, Kat2.1, Kat2.2, Kat2.3) with respect to the corresponding element of the first communication matrix, d) editing the communication data by i) transforming the particular data according to specified rules for the categorized changes (Kat0, Kat1.1, Kat1.2, Kat1.3, Kat2.1, Kat2.2, Kat2.3), ii) discarding the recorded communication data to be associated with an element of the first communication matrix for which no identical or corresponding element exists in the second communication matrix, e) sending the recorded data neither to be discarded nor transformed and sending the transformed data to the control device under test or saving the data to be sent in a file. a) reading in the first and second communication matrix (CM1, CM2), b) comparing the elements (E1, E2, E3, E4, E1', E2', E3', E5') of the communication matrices (CM1, CM2) by i) assigning identical or corresponding elements (E1, E2, E3, E1', E2', E3') in each case, and ii) categorizing changes in the elements (E1', E2', E3', E5') of the second communication matrix relative to the elements (E1, E2, E3, E4) of the first communication matrix, i) assigning identical or corresponding elements (E1, E2, E3, E1', E2', E3') in each case, and ii) categorizing changes in the elements (E1', E2', E3', E5') of the second communication matrix relative to the elements (E1, E2, E3, E4) of the first communication matrix, c) determining the data to be transformed, the data to be transformed being given by such communication data able to be associated with an element of the first communication matrix corresponding to an element (E3') of the second communication matrix, the element (E3') of the second communication matrix comprising categorized changes (Kat1.3, Kat2.1, Kat2.2, Kat2.3) with respect to the corresponding element of the first communication matrix, d) editing the communication data by i) transforming the particular data according to specified rules for the categorized changes (Kat0, Kat1.1, Kat1.2, Kat1.3, Kat2.1, Kat2.2, Kat2.3), ii) discarding the recorded communication data to be associated with an element of the first communication matrix for which no identical or corresponding element exists in the second communication matrix, i) transforming the particular data according to specified rules for the categorized changes (Kat0, Kat1.1, Kat1.2, Kat1.3, Kat2.1, Kat2.2, Kat2.3), ii) discarding the recorded communication data to be associated with an element of the first communication matrix for which no identical or corresponding element exists in the second communication matrix, e) sending the recorded data neither to be discarded nor transformed and sending the transformed data to the control device under test or saving the data to be sent in a file.