layersindividual

Layersindividual is a term used to describe a modeling and design approach in which a system is decomposed into a set of layers, with each layer containing one or more discrete units called individuals. In this framework, a layer represents a level of abstraction or concern (for example, presentation, logic, data, or physical infrastructure), while each individual within a layer encapsulates state, behavior, and interfaces relevant to that level. The combination of layered structure and individual units supports modularity, traceability, and multi-scale analysis.

The term is not standardized across communities, but appears in discussions of modular design, agent-based modeling, and digital twin workflows. It is sometimes used to emphasize the dual nature of system decomposition: vertical layering coupled with horizontal individuation of units within each layer.

Core properties include independence of individuals from other layers, composability of layers, clearly defined interfaces, interoperability between layers, and evolvability of the overall system. The concept also supports visibility into how changes in one layer propagate to others, aiding debugging and analysis.

Applications span software architecture, simulation and modeling, manufacturing digital twins, geographic information systems, and data visualization. For example, a smart city model might use layers such as infrastructure, governance, and economy, with each building, agency, or firm represented as an individual that interacts with others across layers.

See also: layered architecture, agent-based modeling, digital twin, modular design, multi-agent systems.