Method for mounting a modular switch cabinet equipment in a switch cabinet housing, which is equipped with fastening means for several electrical and/or electronic installation modules (5 - 5"') and further optional components, comprising the following steps: a) Provision of a planned design for an application-specific configuration of the switch cabinet equipment to a computer-aided assistance unit, b) Preparation for assembly by analysis of the planned construction and disassembly into individual assembly steps (A, B, C, D) which build on one another and are to be carried out by a fitter or a robot device by the computer-aided assistance unit for determining an efficient assembly step sequence, wherein in the case where a fitter is designated to carry out an assembly step (A; B; D) of the assembly step sequence, the following steps are carried out: c) Visualization of the manual assembly step of the determined assembly step sequence by a display unit (11 - 11") installed at the assembly site for a fitter for image and/or text information as assembly instructions, d) Execution of the manual assembly step by the fitter in accordance with the displayed image and/or text information, e) Acknowledgement of the completed assembly step via an input unit (12 - 12") installed for the fitter at the assembly site for logging the completion and for calling up the next planned assembly step by the computer-aided assistance unit (11 - 11"), wherein, in addition to the individual steps c) to e) to be carried out manually by the fitter according to the case mentioned in step b) as a result of the analysis by the computer-aided assistance unit, at least one automated assembly step to be carried out with the aid of a robot is defined, which automated assembly step: c') is issued by the assistance unit in the form of machine-readable assembly instructions for the assembly of the switch cabinet equipment to a robot device, after which d') the robot device carries out the automated assembly step in accordance with the robot control, and e') after completion of the automated assembly step, the assistant unit acknowledges the automated assembly step to log its completion and to call up the next planned assembly step. a) Provision of a planned design for an application-specific configuration of the switch cabinet equipment to a computer-aided assistance unit, b) Preparation for assembly by analysis of the planned construction and disassembly into individual assembly steps (A, B, C, D) which build on one another and are to be carried out by a fitter or a robot device by the computer-aided assistance unit for determining an efficient assembly step sequence, wherein in the case where a fitter is designated to carry out an assembly step (A; B; D) of the assembly step sequence, the following steps are carried out: c) Visualization of the manual assembly step of the determined assembly step sequence by a display unit (11 - 11") installed at the assembly site for a fitter for image and/or text information as assembly instructions, d) Execution of the manual assembly step by the fitter in accordance with the displayed image and/or text information, e) Acknowledgement of the completed assembly step via an input unit (12 - 12") installed for the fitter at the assembly site for logging the completion and for calling up the next planned assembly step by the computer-aided assistance unit (11 - 11"), wherein, c') is issued by the assistance unit in the form of machine-readable assembly instructions for the assembly of the switch cabinet equipment to a robot device, after which d') the robot device carries out the automated assembly step in accordance with the robot control, and e') after completion of the automated assembly step, the assistant unit acknowledges the automated assembly step to log its completion and to call up the next planned assembly step.