How to Use Network Diagrams in Project Management?

With the help of this beginner's guide, you can visualize tasks, manage dependencies, and meet deadlines by utilizing the power of network diagrams.


Step into the world of project management basics, where the skill of coordinating tasks and deadlines meets a visual companion called a network diagram.

The following article is meant to be your helpful guide through the complicated world of network diagrams for those just starting in project management. Consider them the GPS for your project, offering a clear path despite the chaos of duties and deadlines.

In this article, we'll clarify the fundamentals, review important components, and start you on becoming an expert in project planning with network diagrams. Are you prepared to sort the twists? Let's get started.

In this article
  1. What Is a Network Diagram in Project Management?
  2. Types of Project Network Diagrams
  3. Advantages of Network Diagrams in Project Management
  4. Tips and Tricks for Network Diagram Beginners
  5. Conclusion

What Is a Network Diagram in Project Management?

detailed network diagram template by EdrawMax

Think about making a map of your project that shows each activity and how they link, much like a puzzle with each piece in its proper location. In project management, this is exactly what a network diagram does. It's a visual roadmap allowing you to view the broad picture, plan the steps, and measure your progress.

This is how it works:

  • Tasks are the building blocks: On the diagram, each task in your project is represented by a box or node.
  • Arrows show the flow: Arrows connect the boxes, indicating the order in which tasks must be accomplished. They demonstrate which tasks depend on others and which may be completed independently.
  • Dependencies are key: These are the relationships between tasks. For example, Task A might need to be finished before Task B can start. Dependencies are crucial for understanding the flow of your project and identifying potential bottlenecks.

Imagine it like building a house: you wouldn't begin building walls without a foundation, would you? A network diagram ensures that you are working on the appropriate things at the right time, keeping your project on track and preventing it from collapsing like a house of cards.

Types of Project Network Diagrams

Identifying which task comes before or after another is essential to creating a project network diagram. A dependencies chart must then be drawn. However, you must find a reasonable way to link the tasks before drawing the diagram.

Based on this, a project manager needs to examine these dependencies before drawing the diagram. These days, there are several options for network diagram software that can assist you in cycling through tasks.

Regardless, the arrow and the precedence diagramming approach are components of a project network diagram. Familiarity with these two types of project network diagrams is fundamental.

Arrow Diagram Method (ADM)

The Arrow Diagram Method (ADM), the Activity-on-Arrow (AOA) method, is a project management network diagramming technique.

Unlike the Precedence Diagram Method (PDM), ADM depicts tasks as arrows and dependencies as nodes (circles or squares). This can be a more straightforward option for beginners or projects with fewer complex procedures.

How it works:

  • Activities as arrows: Each arrow symbolizes a task, with the tail signifying the beginning and the head indicating the end. The length of the arrow can indicate how long the task will take, albeit it is not necessarily depicted to scale.
  • Dependencies as nodes: To connect the arrows and indicate the relationships between jobs, circles or squares are utilized. A node, for example, may signal that two tasks cannot begin until a third activity is performed.
  • Dependencies from start to finish: ADM largely employs "finish-to-start" (FS) linkages, which imply that one activity must be completed before the next can begin.

ADM Pros

arrow diagram
  • A visual overview of the project for all stakeholders involved in whatever business capacity.
  • Outlines project steps, tasks, and their sequential execution in detail.
  • The overall timetable, critical deadlines, and reporting dates for each stage are displayed.
  • Allows for dependency tracking, quality monitoring, and the detection of bottlenecks.
  • Simplifies work sequencing for managers and their teams to deliver projects more efficiently.

ADM Cons

  • Creating an arrow diagram requires significant time and ability.
  • The method falls short of providing comprehensive details regarding project tasks.
  • Scaling task timeframes inside the arrow diagram is a difficult operation.

How to create an Arrow Diagram?

There are various steps involved in creating an Arrow Diagram:

Step 1. List all the activities required for the project. Be precise about their order and interdependence.

Step 2. Determine the sequence in which activities must be completed. Create dependencies between tasks.

Step 3. Assign nodes representing each activity's beginning (I-node) and end (J-node).

Step 4. Draw arrows to connect tasks and show the flow and sequence. The arrow connects the I-node to the J-node.

Step 5. Estimate the length of the arrow to represent the duration of each action. Longer arrows represent longer periods.

Step 6. Dummy activities (typically with dotted lines) are used to depict complex interactions between tasks accurately.

Step 7. Ensure that the arrows follow the logical sequence of the project and adhere to the dependencies indicated.

Step 8. Change the length of the arrows to represent the project's overall duration, taking into account deadlines and reporting dates.

Step 9. Check the diagram for accuracy, noting potential bottlenecks or dependencies that need adjustment.

Step 10. Keep a copy of the finished Arrow Diagram for future reference and sharing within the project team.

Precedence Diagram Method (PDM)


The precedence diagramming graphic uses nodes connected by arrows to represent actions. The arrows show the connections between these activities.

Here's how PDM works:

1. Tasks inside boxes: Unlike ADM, PDM centers tasks inside boxes or nodes, which serve as the diagram's main focal point.

2. Dependency arrows: Arrows then connect these boxes to show the connections between the tasks.

3. Four dependency types: PDM supports four types of dependencies, providing greater flexibility in modeling project workflows:

  • Finish-to-start (FS): The most common dependency, where Task B cannot start until Task A is completed.
  • Start-to-start (SS): Task B cannot start until Task A starts.
  • Finish-to-finish (FF): Task B cannot finish until Task A finishes.
  • Start-to-finish (SF): Task B cannot finish until Task A starts.

PDM Pros

  • For precise project scheduling, PDM outperforms ADM.
  • Dependencies and obligations are well communicated.
  • Allows for the evaluation of important activities while assuring focused attention.
  • Stakeholders can scale the project period using time labels and arrows.
  • Effectively highlights the outcomes and consequences of schedule modifications.

PDM Cons

  • It takes time and effort to update and manage changes.
  • During updates, the complexity grows as less comprehensive network information is provided.

Advantages of Network Diagrams in Project Management

Here are the key advantages of using network diagrams in project management:

  • Visual clarity: Network diagrams provide a visual depiction of project tasks, providing a clear and intuitive picture of the structure and flow of the project.
  • Dependency mapping: Allows for discovering and visualizing task dependencies, ensuring a thorough understanding of the relationships between various project tasks.
  • Sequencing and scheduling: Project managers can efficiently plan and deploy resources by facilitating task sequencing and scheduling.
  • Timeline visualization: This feature displays a timeline view of the entire project, highlighting major milestones, deadlines, and the overall project duration.
  • Resource distribution: Aids efficiently distribute resources by indicating when specific resources are required, reducing overloading or underutilization.
  • Risk identification: Assists risk management by revealing potential bottlenecks, dependencies, and important routes, allowing for proactive risk mitigation.
  • Communication tool: Acts as a powerful communication tool, allowing stakeholders to comprehend the project's progress and complexities quickly.
  • Change management: Aids in effective change management by visualizing the effects of changes to the project schedule or job sequencing.
  • Quality control: Aids in monitoring job quality by providing a systematic perspective of the entire project, making discovering deviations from the plan easier.
  • Decision support: Provides valuable decision-making insights, helping project managers to make informed decisions based on a thorough grasp of the project's structure and dependencies.

Tips and Tricks for Network Diagram Beginners

Here are some pointers and strategies to help you peruse network diagrams confidently, even if you're a beginner:

1. Start Simple

  • Don't overburden yourself: Start with simple, achievable tasks to learn the fundamentals of network diagrams.
  • Break down large projects: If you have a major project, break it into smaller, more manageable segments.
  • Concentrate on critical tasks: Outline the most important tasks and their dependencies, then add specifics as needed.

2. Select the Appropriate Method

  • Arrow Diagram Method (ADM): This method is easier for smaller projects with linear workflows.
  • Precedence Diagram Method (PDM): More adaptable for larger projects with complicated dependencies.

3. Gather Accurate Information

  • Make a list of all tasks: Make a complete list of all project tasks.
  • Estimated times: Estimate how long each work will take reasonably.
  • Determine dependencies: Define which duties must be completed by others.

4. Use Consistent and Clear Labeling

  • Descriptive task titles: Use names that reflect the goal of the activity.
  • Visible durations: Make estimated durations visible on the diagram.
  • Consistent symbols and colors: Keep your visual elements consistent for easy interpretation.

5. Maintain Visual Appeal

  • Organize your thoughts logically: Tasks and dependencies should be organized logically and comprehensibly.
  • Use spacing and alignment: To improve readability, use spacing and alignment strategies.
  • Consider colors and shapes: Colors and forms can be used strategically to differentiate task categories or to emphasize essential paths.

6. Review and Update Regularly

  • Check for precision: Review the diagram regularly to ensure it reflects project progress and changes appropriately.
  • Make the necessary changes: To reflect finished tasks, new dependencies, or amended timelines, update the diagram.

7. Use Technology to Your Advantage

  • Project management software: To make the design and administration of network diagrams easier, many solutions come with built-in functionalities.
  • Online diagramming tools: Look at free online network diagramming tools for quick production and collaboration.

8. Communicate and Collaborate

  • Involve team members: Collect feedback from team members to verify that the graphic appropriately depicts project procedures.
  • Distribute to stakeholders: Use the graphic to communicate project plans and progress to stakeholders visually.

9. Practice Makes Perfect

  • Experiment with several methods: Experiment with several diagramming techniques to see what works best for you.
  • Create diagrams for your specific projects: Apply network diagrams to smaller personal projects to hone your skills.
  • Remember that network diagrams are useful tools, not strict rules. Customize them to your specific needs and project context to reap their full benefits.


Gaining a basic understanding of network diagrams makes navigating the world of project management much easier. These diagrams, which act as a visual compass and provide a roadmap for teams and project managers, help to clarify the complexities of job dependencies, sequencing, and scheduling.

Network diagrams are incredibly useful tools that help with risk mitigation, decision-making, and stakeholder communication. As beginners follow this tutorial, they will acquire the skills to create and understand these diagrams and the knowledge necessary to plan projects effectively.

Let's embrace the clarity that network diagrams bring to the ever-changing field of project management and demystify its complexity.

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Edraw Team
Edraw Team Jul 04, 24
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