1. A system for design of experiments (DOE) using direct surface manipulation of a mesh model comprising: a computer system, wherein said computer system includes a memory, a processor, a user input device and a display device; a computer generated geometric model stored in said memory of said computer system, wherein the model is in a computer-aided design (CAD) format; and wherein a user using the computer system for a design of experiments on the geometric model converts the CAD model into a mesh model, evaluates the mesh model using a computer-aided engineering (CAE) analysis, modifies a surface of the mesh model by varying a predetermined parameter, wherein the surface is modified using direct surface manipulation of the surface of the mesh model and the updated mesh model is used in the design of experiments.