Organizational charts are best for showing concepts such as relationships among people, institutions or companies. They are especially helpful in illustrating the hierarchy within an organization. Typically, organizational charts are made up of boxes connected by lines. Each box represents a unit of the organization, with the top box being the division or person that has the most responsibility or power. However, make sure that your organizational chart has a clear purpose because these types of visuals tend to take up large amounts of space. Organizational charts should be limited to 10 or 15 boxes to minimize reader confusion, and similar elements should be combined into one box if necessary.