Design for Excellence (DFX), also referred to as Design for X, is a variable term in product development where 'X' signifies a multitude of characteristics. These characteristics or traits can include manufacturability, cost, quality, reliability, and more. The 'X' provides flexibility in the product development process, allowing for the optimization of a specific aspect of the design. The 'X' in DFX could be applied to overall manufacturing processes that produce your products, such as 3D printing, CNC machining, sheet metal, and more. It provides clear targets or objectives, thereby enhancing the power of design in outcomes.