Method for changing a factory-set design relating to a yarn-lot manufacture of a textile machine, more particularly an open-end rotor spinning machine , to a configuration different from the factory-set design, on the basis of a specific requirement, the textile machine having a plurality of workstations for producing a yarn lot (A1; B1; C1), and a central control device , which is designed to control, on the basis of a control routine (20; 30; 40; 50) which can be read out from a memory , the workstations which produce a same yarn lot (A1; B1; C1) with control data (A2; B2; C2; D2) required for producing the same yarn lot (A1; B1; C1), and the workstations being factory-equipped such that different yarn lots (A1, B1, C1), having at least a first yarn lot (A1), a second yarn lot (B1) and a third yarn lot (C1), can be produced by means of the workstations independently of each other, characterised in that the method has - a step of creating a selection of control routines , having a first control routine for controlling all workstations with control data (A2) for producing the first yarn lot (A1), a second control routine for controlling a first group (A) of workstations with control data (A2) for producing the first yarn lot (A1) and for controlling a second group (B) of workstations with control data (B2) for producing the second yarn lot (B1), and a third control routine for controlling groups (A; B, C, D) of workstations , which groups are to be defined with respect to the number of groups, with control data (A2; B2; C2; D2) corresponding to respective yarn lots (A1; B1; C1) assigned to the groups (A; B, C, D), the number of the groups (A, B, C, D) which are to be defined exceeding two; - subsequently, a step of activating a control routine (20; 30; 40; 50) stored in advance, selected from the created selection of control routines ; - subsequently, a step of assigning workstations to a group (A, B, C, D) to be controlled on the basis of the activated control routine (20; 30; 40; 50); and - subsequently, a step of controlling the group (A; B; C; D) of workstations in question with correspondingly assigned control data (A2; B2; C2; D2) on the basis of the activated control routine (20; 30; 40; 50) by means of the central control device , the activated control routine leading to a configuration of the textile machine which is changed in comparison with the factory-set design of the textile machine. - a step of creating a selection of control routines , having a first control routine for controlling all workstations with control data (A2) for producing the first yarn lot (A1), a second control routine for controlling a first group (A) of workstations with control data (A2) for producing the first yarn lot (A1) and for controlling a second group (B) of workstations with control data (B2) for producing the second yarn lot (B1), and a third control routine for controlling groups (A; B, C, D) of workstations , which groups are to be defined with respect to the number of groups, with control data (A2; B2; C2; D2) corresponding to respective yarn lots (A1; B1; C1) assigned to the groups (A; B, C, D), the number of the groups (A, B, C, D) which are to be defined exceeding two; - subsequently, a step of activating a control routine (20; 30; 40; 50) stored in advance, selected from the created selection of control routines ; - subsequently, a step of assigning workstations to a group (A, B, C, D) to be controlled on the basis of the activated control routine (20; 30; 40; 50); and - subsequently, a step of controlling the group (A; B; C; D) of workstations in question with correspondingly assigned control data (A2; B2; C2; D2) on the basis of the activated control routine (20; 30; 40; 50) by means of the central control device , <EOS>