Method for checking the quality of printed products which are consecutively produced in a particular production operation by means of multiple printing presses, in each case at least three printed images (03; 04; 06) being arranged on a respective area to be printed of each of these printed products so as to be spaced apart from one another at a distance (A; B; C; D) defined for this printed product; these at least three printed images (03; 04; 06) being each printed in printing methods that differ from one another; for checking the quality of the respective printed product, two printed images (03; 04; 06) printed in differing printing methods being selected by an inspection system to form a printed image pair; the printed image pair being assigned a distance dimension that is defined for the distance (A; B; C; D) between its printed images (03; 04; 06); prior to the start of the particular production operation, this distance dimension being provided with a tolerance that is defined as a function of the printing methods used in the relevant printed image pair; at least in a subset taken from the quantity of all printed products that have been consecutively produced in the particular production operation, the quality of the produced printed products being checked in that, during the particular production operation, in each case an instantaneous value for the respective distance (A; B; C; D) between the printed images (03; 04; 06) selected for this printed image pair being ascertained by means of a processing unit of the inspection system, with the printed image pair being the same in each case; the processing unit comparing the respective value of the relevant distances (A; B; C; D), which is instantaneously ascertained in each case, to the distance dimension defined for this distance (A; B; C; D), taking into consideration the associated tolerance, and ascertaining a deviation of the respective value of the relevant distances (A; B; C; D), which is instantaneously ascertained in each case, from its defined distance dimension, taking into consideration the associated tolerance; a steel engraving method and an offset printing method being used as printing methods for printing the printed images (03; 04; 06) involved in the production of each printed product; an intaglio printing press being used for carrying out the steel engraving method, and an offset printing press being used for carrying out the offset printing method, characterized in that, additionally, a screen printing method is used as a printing method for printing the printed images (03; 04; 06) involved in the production of each printed product; a screen printing press being used for carrying out the screen printing process; multiple steel plates being alternately used in the same production operation for carrying out the steel engraving process in the intaglio printing press; and for at least two of the steel plates involved in carrying out the steel engraving process or for all steel plates involved in carrying out the steel engraving process, the processing unit in each case selectively ascertaining the deviation of the respective value of the relevant distances (A; B; C; D), which is instantaneously ascertained in each case, from its defined distance dimension.