A method for optimizing simultaneous use of a multitude of coordinate measuring devices at a multitude of locations, comprising: obtaining job information about a multitude of coordinate measuring jobs at the multitude of locations, the job information comprising the position of one or more objects, a time for performing the job, required capabilities of involved devices, and required certifications and/or calibrations for the involved devices; determining an actual position and a condition of each device, the condition comprising a measuring precision and a measuring speed, individual conditions of a plurality of components of the device, a maintenance status and a certification and/or calibration status; performing a job analysis involving the obtained job information and the determined positions and conditions; and performing, based on a result of the analysis, an assignment optimization for assigning at least a subset of the devices to the jobs.

It is possible to update a process plan, a work plan, and a production plan in a short time with respect to a production fluctuation event and flexibly deal with the production fluctuation. A production planning device includes: a process plan generation unit which generates a plurality of process plans including an alternative process plan, the process plans relating to a production process of a product; a work plan generation unit which generates a work plan corresponding to each of the process plans; a production plan generation unit which generates a production plan using the plurality of process plans and the work plan; and a production plan redrafting unit which redrafts a production plan using the plurality of process plans and the work plan when a production fluctuation event occurs.