UML's problem is that it is boxes-and-lines. The trouble with boxes-and-lines is that they work fine for small problems and collapse in a mess of overlapping n

UML's problem is that it is boxes-and-lines. The trouble with boxes-and-lines is that they work fine for small problems and collapse in a mess of overlapping nonsense for complex situations. This is not a UML specificthing. Any visualisation that is boxes and lines that is not a strict acyclic single parent heirachy is doomed to failure for anything complex.