Method by which milk/air emulsions, particularly milk foams, are produced by a device for producing a milk foam, wherein the device at least comprises: a) a milk duct flowed through by milk, b) at least one air feed system for producing a milk/air emulsion from the milk, c) a processing device for heating a milk/air emulsion at a first temperature T1, d) at least one first measuring unit (8 or 11) for determining at least one physical substance property of the milk/air emulsion, and e) a regulating and evaluating unit arranged to set a control variable on the basis of the physical substance property of the milk/air emulsion, wherein the regulating and evaluating unit comprises a data memory in which data sets of target values and/or target value ranges are filed in dependence on the temperature and/or a desired drink with milk content and/or a supplied kind of milk, wherein the method comprises at least the following steps: A) determining the physical substance property of the milk/air emulsion by at least the first measuring unit (8 or 11), B) carrying out a comparison by the regulating and evaluating unit between an actual value and a target value range of this physical substance property, wherein the regulating and evaluating unit uses a data memory in which data sets of target values and/or target value ranges are filed in dependence on the temperature and/or a desired drink with milk content and/or a supplied kind of milk, C) wherein insofar as the actual value lies outside the target value range a setting of at least one setting variable in the method is undertaken by the regulating and evaluating unit in such a way that the physical substance property is influenced, characterised in that D) the regulating and evaluating unit during a draw determines a non-constant profile, which is variable during the draw, of target values and/or target value ranges and thereafter undertakes the regulation. a) a milk duct flowed through by milk, b) at least one air feed system for producing a milk/air emulsion from the milk, c) a processing device for heating a milk/air emulsion at a first temperature T1, d) at least one first measuring unit (8 or 11) for determining at least one physical substance property of the milk/air emulsion, and e) a regulating and evaluating unit arranged to set a control variable on the basis of the physical substance property of the milk/air emulsion, wherein the regulating and evaluating unit comprises a data memory in which data sets of target values and/or target value ranges are filed in dependence on the temperature and/or a desired drink with milk content and/or a supplied kind of milk, A) determining the physical substance property of the milk/air emulsion by at least the first measuring unit (8 or 11), B) carrying out a comparison by the regulating and evaluating unit between an actual value and a target value range of this physical substance property, wherein the regulating and evaluating unit uses a data memory in which data sets of target values and/or target value ranges are filed in dependence on the temperature and/or a desired drink with milk content and/or a supplied kind of milk, C) wherein insofar as the actual value lies outside the target value range a setting of at least one setting variable in the method is undertaken by the regulating and evaluating unit in such a way that the physical substance property is influenced, characterised in that D) the regulating and evaluating unit during a draw determines a non-constant profile, which is variable during the draw, of target values and/or target value ranges and thereafter undertakes the regulation.