Wu Xing (Five Phases)

Origin. Zou Yan, 3rd century BCE; systematized during the Han dynasty; foundational to Chinese cosmology, medicine, and statecraft.

Mechanism. Five phases — Wood, Fire, Earth, Metal, Water — describe modes of change and relationship. Each phase generates the next (the generating cycle: Wood feeds Fire, Fire creates Earth/ash, Earth bears Metal, Metal collects Water, Water nourishes Wood) and controls another (the controlling cycle: Wood parts Earth, Earth dams Water, Water quenches Fire, Fire melts Metal, Metal cuts Wood). Systems are analyzed by identifying which phase dominates and whether the cycles are in balance.

Procedure. Map the system's elements onto the five phases by their qualities: Wood (growth, expansion, initiative), Fire (transformation, intensity, culmination), Earth (stability, centering, transition), Metal (contraction, refinement, decline), Water (storage, potential, dormancy). Identify the current dominant phase. Trace the generating and controlling relationships. Diagnose imbalance: is one phase excessive? Is a controlling relationship too weak? Intervene by strengthening the controlling phase or supporting the generating cycle.

Applies to. Cyclical analysis, understanding phase transitions, diagnosing systemic imbalance, timing interventions.

Limitations. The five-phase mapping is interpretive and flexible enough to fit any situation — which means it constrains nothing. The cycles describe qualitative dynamics without quantitative prediction. The framework is a language for discussing change, not a causal model.