Method for checking a level of screwing quality of a screwdriver against a predetermined screwdriving target comprising the following steps: - obtaining (4.3), at a predetermined angular frequency, a series of doublets that is representative of the rise in torque of the screwing of at least one screw screwed by said screwdriver, constituting a first table of values, each doublet comprising an angle value and a torque value; - determining (4.4), from said first table of values, a second table of values showing the torque as a function of the angle, and representative of the true characteristic of the at least one screw; and - determining (4.5.1) a third table of values presenting the torque as a function of the angle and representative of the disturbances induced by said screwdriver during the rise in torque of the screwing of at least one screw, on the basis of the first and second tables; wherein said steps of obtaining (4.3) a series of doublets, of determining (4.4) a second table and of determining (4.5.1) a third table are implemented for at least a first and a second screwing of screws by said screwdriver, producing at least two corresponding third tables, referred to as unit third screwdriving tables, characterised in that it comprises a step of carrying out optimised aggregation (7.1, 9.1) of at least two of said unit third screwdriving tables, comprising a step of deleting (7.1.1, 9.1.3), from at least one of said unit third screwdriving tables, a number of values that is determined according to a periodicity optimisation criterion, said optimised aggregation step producing a candidate aggregate third table, and in that it comprises a step of analysing an aggregate third table (4.5.2, 4.5.3, 4.5.4, 4.5.5, 4.5.6, 4.6) taking account of said candidate aggregate third table, producing at least one item of information representative of a dispersion and/or of a deviation from said screwing target, resulting from disturbances induced by said screwdriver. - obtaining (4.3), at a predetermined angular frequency, a series of doublets that is representative of the rise in torque of the screwing of at least one screw screwed by said screwdriver, constituting a first table of values, each doublet comprising an angle value and a torque value; - determining (4.4), from said first table of values, a second table of values showing the torque as a function of the angle, and representative of the true characteristic of the at least one screw; and - determining (4.5.1) a third table of values presenting the torque as a function of the angle and representative of the disturbances induced by said screwdriver during the rise in torque of the screwing of at least one screw, on the basis of the first and second tables; wherein said steps of obtaining (4.3) a series of doublets, of determining (4.4) a second table and of determining (4.5.1) a third table are implemented for at least a first and a second screwing of screws by said screwdriver, producing at least two corresponding third tables, referred to as unit third screwdriving tables, characterised in that it comprises a step of carrying out optimised aggregation (7.1, 9.1) of at least two of said unit third screwdriving tables, comprising a step of deleting (7.1.1, 9.1.3), from at least one of said unit third screwdriving tables, a number of values that is determined according to a periodicity optimisation criterion, said optimised aggregation step producing a candidate aggregate third table, and in that it comprises a step of analysing an aggregate third table (4.5.2, 4.5.3, 4.5.4, 4.5.5, 4.5.6, 4.6) taking account of said candidate aggregate third table, producing at least one item of information representative of a dispersion and/or of a deviation from said screwing target, resulting from disturbances induced by said screwdriver. <EOS>