Virtual prototyping is probably the biggest benefit that comes from using computer aided design. Virtual prototyping allows for high quality designing. By that I mean you can fit parts with the proper clearances and check for the interference of parts before ever spending a dime on materials. You can also “dress” the product in various material finishes and colors to see what your product will look like. By the time you get to the point where you’re going to make a physical prototype, you’ve got a good idea of how it will operate and what it will look like. The changes that are made in the physical prototype, after having been designed as a virtual prototype, are far less than if a virtual model had never been created. Almost every model or product, goes through an evolution of changes to it’s appearance because you’re able to see how it will appear before making a physical prototype. CAD is an amazingly beneficial tool for designing products.