Are there examples of products that have successfully implemented the concept of signifiers?

A small business can use the key topics or framework covered in The Design of Everyday Things to improve their product design by implementing the principles of "human-centered" design. This involves understanding the needs and capabilities of the user and designing products that are intuitive and easy to use. For example, the concept of "signifiers" can be used to guide the user's actions - like a flat panel on a door indicating it needs to be pushed. By focusing on these principles, a small business can create products that are not only functional but also enjoyable and easy to use.

The Design of Everyday Things by Don Norman provides several case studies and examples to illustrate the principles of human-centered design. One key example is the concept of signifiers and affordances. A signifier is a signal for some sort of affordance, an action that can be taken. For instance, a flat panel on a door is a signifier that signals the need to push it open. This example illustrates the importance of intuitive design - if external signs have to be added to something as simple as a door, it indicates bad design. The broader implication is that good design should be intuitive and not require additional instructions or signs. This principle can be applied to a wide range of design contexts, from product design to user interface design.