Sikhana Seekho

Precedence Diagramming Method

Precedence Diagramming Method – Key Steps and Benefits

In project management, the success of any project depends mainly on the ability of the project manager to plan and execute tasks effectively. One of the most popular techniques used for project planning is the Precedence Diagramming Method (PDM), also known as the Activity on Node (AON) method. PDM is a visual scheduling tool that uses a graphical network to represent project tasks and their dependencies. This article will discuss the Precedence Diagramming Method in detail, its benefits, and how it can be used in project management.

Overview of Precedence Diagramming Method (PDM)

Precedence Diagramming Method (PDM) is a network diagramming technique used in project management. The process is used to identify the sequence of activities required to complete a project. The method employs a graphical representation of the project activities, including their dependencies and interrelationships. The PDM model represents the activities as nodes and the relationships as links.

The PDM diagram depicts the critical path, which is the sequence of actions that must be completed to finish the project on time. In PDM, the activities are represented by boxes, and arrows represent the dependencies. The arrows indicate the flow of activities from one task to another.

Benefits of the Precedence Diagramming Method

The Precedence Diagramming Method has several benefits in project management, some of which include the following:

  1. Improved project planning: PDM visually represents the project activities, making it easy to identify dependencies and relationships between tasks. This helps in better project planning and scheduling.
  2. Improved project communication: PDM enables project teams to clearly and concisely communicate project activities and their relationships, leading to a better understanding of project requirements and expectations.
  3. Improved project management: PDM helps project managers monitor progress, identify delays, and make necessary adjustments to keep the project on track.
  4. Improved risk management: PDM helps identify potential risks in the project by highlighting critical tasks and dependencies. This enables project managers to take necessary measures to mitigate risks.

Steps involved in Precedence Diagramming Method

The Precedence Diagramming Method involves several steps to develop a comprehensive PDM diagram. These steps include:

  1. Define the project scope: The first step in PDM is to define the project scope, objectives, and requirements. It will help in identifying the project activities and their relationships.
  2. Identify project activities: The next step is identifying all the actions required to complete the project. These activities should be placed systematically and logically, considering their dependencies and relationships.
  3. Determine activity dependencies: Once the activities have been identified, the next step is to determine their dependencies. This involves identifying the actions that must be completed before other activities begin.
  4. Develop the PDM diagram: The diagram is developed by representing each activity as a node and connecting the nodes with arrows to indicate their dependencies. The diagram also shows the duration of each activity and the critical path.
  5. Identify the critical path: The essential way is the sequence of activities that must be completed on time to ensure the project is on schedule. It is identified by identifying the PDM diagram’s most extended series of activities.
  6. Calculate activity durations: The duration of each activity is calculated based on the resources required, the complexity of the task, and other factors that may affect the time.
  7. Monitor project progress: Once the PDM diagram has been developed, it is essential to monitor project progress regularly to ensure that the project is on track. It involves tracking the completion of each activity and identifying any delays or issues that may arise.


The Precedence Diagramming Method is a powerful tool in project management that helps project teams plan, schedule, and execute tasks more effectively. By representing project activities and their dependencies in a visual format, PDM provides a clear understanding of project requirements and expectations. PDM also enables project teams to communicate project activities and their relationships more effectively, leading to better collaboration and teamwork.

In conclusion, the Precedence Diagramming Method is a valuable technique in project management that project managers should use to improve project planning, communication, and execution. By following the steps involved in PDM, project managers can develop comprehensive PDM diagrams that represent project activities and their dependencies clearly and concisely. That enables project teams to complete projects on time, within budget, and with the desired quality.

Parametric Estimating is recommended for all those who are interested in all latest things happening in the world!

1 thought on “Precedence Diagramming Method – Key Steps and Benefits”

  1. Pingback: Parametric Estimating - Critical for Accurate Project Budgeting

Leave a Comment

Your email address will not be published. Required fields are marked *