Method for determining the filling quantity in the actuating system of a clutch arrangement which has a forward clutch and a reverse clutch for the respective connection of an input shaft to an output shaft for drive purposes, wherein for actuating the forward clutch there is a first controllable actuating unit and for actuating the reverse clutch there is a second controllable actuating unit, characterized by the following method steps: continuously driving the input shaft at a speed (n E), applying a hydraulic pressure (p 1) to the first of the first or second actuating unit (20, 22) over a time interval (t 1), measuring and storing the speed (n A) of the output shaft as a first reference speed (n A,Ref1) and releasing the hydraulic pressure (p 1) in the first of the first or second actuating unit (20, 22) at the end of the time interval (t 1), continuously measuring the speed (n A) of the output shaft and detecting the length of a time interval (t 2) at the end of which the speed (n A) has dropped to a factor X < 1 of the first reference speed (n A,Ref1), calculating and storing the mean acceleration (a mittel) of the output shaft over the time interval (t 2), filling the at least partially emptied second of the first or second actuating unit (22, 20) over a time interval (t 3), measuring and storing the speed (n A) of the output shaft as a second reference speed (n A,Ref2) at the end of the time interval (t 3), comparing the second reference speed (n A,Ref2) with a speed (n A,calc) of the output shaft calculated at the end of the time interval (t 3) from the first reference speed (n A,ref1) and the mean acceleration (a mittel), renewed implementation of the previous method steps, with an extended time interval (t 3,ver1 when the second reference speed (n A,Ref2) is approximately equal to the calculated speed (n A,calc) or with a short time interval (t 3, verk) when the second reference speed (n A,Ref2) is less by a factor Y > 1 than the calculated speed (n A,Calc), storing the length of the time interval (t 3, t 3, ver1, t 3, verk) when the second reference speed (n A,Ref2) is approximately less than the calculated speed (n A,Calc). continuously driving the input shaft at a speed (n E), applying a hydraulic pressure (p 1) to the first of the first or second actuating unit (20, 22) over a time interval (t 1), measuring and storing the speed (n A) of the output shaft as a first reference speed (n A,Ref1) and releasing the hydraulic pressure (p 1) in the first of the first or second actuating unit (20, 22) at the end of the time interval (t 1), continuously measuring the speed (n A) of the output shaft and detecting the length of a time interval (t 2) at the end of which the speed (n A) has dropped to a factor X < 1 of the first reference speed (n A,Ref1), calculating and storing the mean acceleration (a mittel) of the output shaft over the time interval (t 2), filling the at least partially emptied second of the first or second actuating unit (22, 20) over a time interval (t 3), measuring and storing the speed (n A) of the output shaft as a second reference speed (n A,Ref2) at the end of the time interval (t 3), comparing the second reference speed (n A,Ref2) with a speed (n A,calc) of the output shaft calculated at the end of the time interval (t 3) from the first reference speed (n A,ref1) and the mean acceleration (a mittel), renewed implementation of the previous method steps, with an extended time interval (t 3,ver1 when the second reference speed (n A,Ref2) is approximately equal to the calculated speed (n A,calc) or with a short time interval (t 3, verk) when the second reference speed (n A,Ref2) is less by a factor Y > 1 than the calculated speed (n A,Calc), storing the length of the time interval (t 3, t 3, ver1, t 3, verk) when the second reference speed (n A,Ref2) is approximately less than the calculated speed (n A,Calc).