The core of product design methodology is user-centered design. It's crucial to understand the needs, wants, and limitations of the people who will be using your product. By conducting user research, creating user personas, and user testing, you can design a product that resonates with your target audience. I've seen firsthand how this approach can lead to increased customer satisfaction and ultimately, business success.

Design thinking is a problem-solving approach that's central to product design methodology. It involves empathizing with users, defining problems, ideating solutions, prototyping, and testing. By following this process, designers can create innovative solutions that meet user needs and business goals. As a design expert, I've facilitated countless design thinking workshops and seen the incredible results it can produce.

Prototyping and testing are critical steps in the product design methodology. They allow designers to validate their ideas, identify issues, and refine their designs. By creating prototypes and testing them with users, designers can ensure their products are both usable and enjoyable. I've had the privilege of working with some of the most innovative companies in the world, and I've seen how prototyping and testing can make all the difference in creating a successful product.