Project Schedule with Precedence Diagramming Method (PDM)
The Precedence Diagramming Method (PDM) is a project management technique used in the scheduling of activities or tasks within a project. It is a graphical representation of the sequence of tasks needed to complete a project, showing the relationships between tasks and their dependencies.
Overview
- Shows Activities in boxes or circles called nodesand connects the nodes with arrows.
- Arrows/Lines represent the relationship and the dependencies of the work packages.
- The activities are either successors or predecessors.
Types of PDM
Finish to Start
- Describes the flow of work.
- Activity A = Predecessor
- Activity B = Successor
- A has to finish so B can start.
- e.g. You have to finish priming the wall so you can paint the wall.
Start to Start
- A must start, so B can start.
- Letting two activities start so they can work in parallel.
- Typically, A will start a little bit before B.
- e.g. once people log-in in their classroom computers, then the software updates will happen.
