Pace Layers, first created by Stewart Brand, describe how different aspects of a system change at different speed. This framework helps explain how different forces—like technology, business priorities, and cultural values—impact the evolution of design work.

The fastest layers (trends in aesthetics or market demands) influence the more superficial aspects of interaction design, such as UI styles or features added to attract users quickly. These changes are important for staying competitive but tend to have short lifespans. Meanwhile, slower layers like societal behaviors or human cognition provide a foundation for designs that remain effective over time. For instance, principles like ease of use or accessibility are rooted in deeper, more stable layers like “Culture” or “Nature.”

This framework encourages designers to think about which aspects of their work need frequent updates and which should be designed for long-term stability. For example, updating visual styles to follow trends is crucial in the short term, but building designs around enduring user needs ensures longevity.