Step 1: Understand the factors shaping organizational structure.
  
The span of management refers to the number of subordinates a manager or supervisor can effectively manage. A larger span generally leads to a flatter organizational structure, while a narrower span can result in more hierarchical levels.
Step 2: Evaluate the options.
  
- The span of management is directly related to how an organization's structure is designed. It affects communication, decision-making, and the distribution of tasks.
Step 3: Conclude.
  
The correct answer is Span of management as it determines the organization’s structure and shape.
  
 
Final Answer:  
\[
\boxed{\text{Span of management}}
\]