1. A device for formulating numerical models of manufactured products by defining predetermined numerical data, comprising: a display unit; a storage unit configured to store numerical data for each model, the numerical data corresponding to components of a manufactured product, variables and constraints; a processor configured to formulate a numerical model, the processor including a structure construction unit configured to generate and store in the storage unit numerical data corresponding to a structure of the manufactured product, the structure being a tree structure linking different structural components of the manufactured product, a constraint unit configured to define constraints for conformance with the numerical model, and a validation unit configured to display, on the display unit, the numerical data stored in the storage unit, and a plurality of validation selections to validate inclusion of the displayed numerical data of a previously formulated numerical model when executing the numerical model, wherein the display unit displays at least one acquisition window corresponding to each unit and configured to acquire numerical data, and an execution window corresponding to each unit and configured to execute a functional model that defines a manufactured product configuration.