ADM (Arrow Diagramming Method) is the same as AOA (Activity On Arrow)
PDM (Predecessor Diagramming Method) is the same as AON (Activity On Node)
- ADM requires the use of a dummy activity to reflect relationships between events. In PDM yo don't have a dummy.
- In ADM, an activity is represented by an arrow, and events are represented by a point. In PDM, an activity is represented by a box, arrows represent dependencies.