Span of management refers to the number of subordinates directly reporting to a manager. Graicunas developed a formula showing the number of relationships a manager must manage increases geometrically with additional subordinates. Determinants of span include organizational size, mission, strategy, and environmental factors. Span is categorized as narrow, wide, or matrix. Narrow spans create tall hierarchies while wide spans result in flatter structures. Technology and environmental volatility also impact span. Larger organizations tend towards narrower spans while non-routine technologies allow for wider spans.