Models play an essential role in the design and development process of products. There is even a saying: "A picture is worth a thousand words, but a model is worth a thousand pictures," and it's true! Models help validate or invalidate initial ideas, facilitate usability testing and other functional assessments, assess ergonomics and human factors, and evaluate the product's aesthetics at a 1:1 scale. In this post, we will delve into the role of models in the design and development process of products, exploring the different types of models and their functions at various stages of product development to ensure the best product design.