Balanced hierarchy
Each path in a balanced hierarchy descends to the same depth.
For example, in the following diagram, the highest level is Product Line(Level 1); Level 2 is Product Type; Level 3 is Products.

Each path in a balanced hierarchy descends to the same depth.
For example, in the following diagram, the highest level is Product Line(Level 1); Level 2 is Product Type; Level 3 is Products.