A system to carry out a systematic selection of a specification for a first vehicle. The specification includes several parameters related to at least one characteristic for the first vehicle. The system includes a collection device for collection of operational data from at least one other vehicle. The operational data comprises information about how the at least one other vehicle has been used. A simulation device simulates how an adjustment of at least one of the several parameters impacts the at least one characteristic for the first vehicle. The simulation being based on the operational data. Also, selection device selects at least one specification based on the simulation.