This boolean data property designates components that occupy intermediate positions in the theoretical hierarchy of causal relationships, neither primary drivers nor merely peripheral factors. When true, it indicates entities that make substantial but not dominant contributions to sociological processes, often serving as important mediating variables or significant contextual influences. This property captures the middle ground between central and marginal causal factors, acknowledging that many sociological relationships involve multiple moderately important elements rather than simple primary-secondary distinctions. It enables more precise theoretical modelling by recognizing the complex, multi-layered nature of social causation where several factors may contribute meaningfully without any single element being overwhelmingly dominant.