Systemic Levels refer to the hierarchical levels of granularity (Macro, Mezzo, Micro) in which a complex system can be described or analyzed by decomposition and analysis of interactions, at each level of composition.

 Systemic Levels help model the structure and behavior of complex systems to understand how individual elements come together to form a coherent whole, and how system properties and functionality emerge from their interactions at different levels.

Emergent properties result from nonlinear interactions, feedback, and self-organization that occur at different  Systemic Levels, and are often difficult to anticipate or control.

Emergence is a key concept for understanding the complexity, resilience and evolution of complex systems.