Product design is the most important thing for inventors to focus on as they work to turn their ideas and patents into actual prototypes. Product design is the determining factor in the success, or failure, of a product and idea. Product design focuses on the look, feel and actions of the actual prototype. Inventors need to focus on every single aspect of their product design. Each and every angle of the product design should be reviewed, as each piece needs to operate correctly and efficiently. There are three main aspects to consider with product design: function, exterior design and testing. The first thing an inventor should focus on is the function of the prototype. An inventor needs to understand how the prototype is supposed to work and the parts necessary to make it function. This aspect of design will help manufacturers and builders understand how all of the parts of the prototype work together. The second thing an inventor should focus on, in terms of product design, is the external design of the prototype. A product needs to look good, as aesthetic features can often be as important as function. Inventors need to work to create an external design that is both pleasing to the eye and able to handle the various functions of the prototype. Finally, inventors need to test out their prototypes. They need to test the product design for functionality, working to see if the design actually achieves the desired result. Inventors also need to test external design by asking individuals how they feel about the overall look and feel of the product. Inventors may not be able to handle all of this product design on their own. Professionals can be hired to create the external design, internal function and testing portions of overall product design. These professionals can give your prototype the best possible chance at success.