Computerized method for producing a two-dimensional plant model of a modular production plant for producing a chemical product, wherein the production plant has at least two process modules, which can be connected to one another for production purposes and are intended to respectively carry out an overall process required for production or a particular process section, and at least one process container in which the process modules can be at least partially accommodated as intended, wherein the process container is a unit which can be transported as a whole, and - wherein, for each process container, a common two-dimensional container model of its base area and of the base area of a container environment at least partially surrounding the process container and of a predefinable size is generated, - wherein, for each process module, a two-dimensional module model of its base area is generated, - wherein the container model and the module models are divided into grid fields (1, 4) which are of the same size and are preferably square, - wherein each grid field of a module model is assigned a module property concerning the occupancy of the respective grid field by a functional device of the respective process module, which functional device is arranged above that section of the base area of the respective process module which corresponds to this grid field, by an operations room which is allocated to the process module and is arranged above that section of the base area of the respective process module which corresponds to this grid field, or by a material output of the process module, which output is arranged above that section of the base area of the respective process module which corresponds to this grid field, - wherein each grid field of the container model is assigned one of the properties "inside the container" or "outside the container" and an occupancy property concerning the possibility or impossibility of the respective grid field being occupied by a module property, - wherein the module models are arranged in the container model taking into account the module properties and the occupancy properties. - wherein, for each process container, a common two-dimensional container model of its base area and of the base area of a container environment at least partially surrounding the process container and of a predefinable size is generated, - wherein, for each process module, a two-dimensional module model of its base area is generated, - wherein the container model and the module models are divided into grid fields (1, 4) which are of the same size and are preferably square, - wherein each grid field of a module model is assigned a module property concerning the occupancy of the respective grid field by a functional device of the respective process module, which functional device is arranged above that section of the base area of the respective process module which corresponds to this grid field, by an operations room which is allocated to the process module and is arranged above that section of the base area of the respective process module which corresponds to this grid field, or by a material output of the process module, which output is arranged above that section of the base area of the respective process module which corresponds to this grid field, - wherein each grid field of the container model is assigned one of the properties "inside the container" or "outside the container" and an occupancy property concerning the possibility or impossibility of the respective grid field being occupied by a module property, - wherein the module models are arranged in the container model taking into account the module properties and the occupancy properties.