thinking in prototypes

The reading of this article was very useful to understand what a prototype is about, all the pros and cons of the new technologies that designers can use nowadays to create "3d sketchs" as they call them, and how we've managed to reduce the process of developing a new product, because rendering is not enough anymore you have to physically see and touch the object to find the flaws that will be corrected later and observe the interaction between the user and the product.

All the errors that can be found in a prototype will dramatically reduce the cost as they are found in an early stage of the process.