Provided is a method for allocating assemblies to placement lines for placing components on the assemblies, wherein an expected production time is determined for each assembly type of the assemblies to be provided with components and for each placement line, taking into consideration each cycle time for the assembly type on the placement line and the expected number of pieces to be produced for each assembly type. The actual number of pieces to be produced arises according to a predeterminable probability distribution, wherein the possible allocations of assemblies to the placement lines are restricted by the existing infrastructure and/or by user defined specifications, and the allocation of the assemblies to the placement lines is calculated by means of an optimization method.