First Diagramming instal the new install#

In this case, you cannot move into your new home until it is ready. This is the most common relationship in the AON diagram.įor example, suppose you are moving into a new home, and your old home has to be demolished. In this relationship, the next activity cannot start until the first is complete. The precedence diagramming method (PDM) uses four relationships: Dependency Relationship in Precedence Diagram These dependencies are within the control of your project or organization.įor example, you cannot get a resource until it is free from another project. The project management team has no control over an external dependency.įor example, you may need government approval before starting the next activity. With discretionary dependency, you can change the sequence of activities as per your preferred logic.

However, if constructing them in a certain sequence is beneficial, you build them in that order. This dependency, also known as preferential or soft logic, plays a role in optimizing resources.įor example, you can construct the four walls in any sequence.

First Diagramming instal the new install#

Starting the next activity depends on it.įor example, you cannot install the ceiling until you build all the walls. This dependency is also known as hard logic, meaning it’s a fixed reality you cannot avoid. Type of Dependencies in Precedence Diagram Therefore, these diagrams are also known as activity on node (AON) diagrams. An arrow connects two boxes and shows the relationship. The precedence diagram is made of rectangles known as nodes.