This document discusses understanding simplicity, complexity, and chaos in design. It introduces Thomas Vander Wal and the Cynefin framework, which categorizes systems as simple, complicated, complex, or chaotic. Simple systems involve direct cause-and-effect relationships that are easily understood. Complicated systems can be analyzed systematically using practices and procedures. Complex systems involve emergent behaviors and require adaptable solutions through small experiments. Chaos occurs when there is no relationship between actions and outcomes. The document advocates embracing complexity rather than chaos by discovering patterns of cause and effect.