Arrow Diagram - Lean Six Sigma Glossary

An Arrow diagram, also known as a Network or Precedence diagram, is a project management tool that is used to visualize the inter-dependencies between tasks in a project. It provides a clear picture of the project timeline and identifies critical paths that the project owner should monitor closely.

What is an Arrow Diagram?

An Arrow diagram is a graphical representation of a project that shows the flow of tasks and the dependencies between them. It uses arrows to represent the relationships between tasks, and it is useful to schedule and monitor project activities.

Benefits of using an Arrow Diagram

Visual representation of project activities: The diagram provides a clear picture of all the tasks involved in a project, and how they are related to each other.
Improved project planning: The diagram helps to identify task dependencies, which can inform project planning and resource allocation.
Better project management: The diagram enables project managers to keep track of project progress and make any necessary adjustments to keep the project on schedule.
Early identification of project risks: The diagram can help identify potential bottlenecks and critical paths, allowing project managers to take proactive measures to mitigate project risks.

Elements of an Arrow Diagram

Tasks: Represented as boxes, they show individual activities or work items within a project.
Arrows: Show relationships between tasks, indicating which task you should complete first before others can start.
Start and End Nodes: Represent the beginning and end of the project.
Task Durations: Show the estimated time required for completion of each task.
Dependencies: Indicate relationships between tasks, such as finish-to-start or start-to-start.
Critical Path: The sequence of tasks with the longest total duration and no slack time.
Slack Time: The amount of time you can delay a task without affecting the overall project timeline.
Milestones: Represent key project accomplishments or major deliverables.
Resource Allocation: Show the resources (e.g. personnel, equipment) assigned to each task.
Network Logic: Show the flow of tasks, indicating the sequential and concurrent activities.

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How to create an Arrow Diagram

Define the project scope and objectives.
List all project tasks and activities.
Determine task dependencies: identify which tasks must be completed before others can start.
Draw the diagram: use arrows to represent task dependencies and place tasks in a sequential order.
Review and refine the diagram: make any necessary changes to the diagram based on feedback and project updates.

An Arrow diagram is an essential tool for project managers. It provides a clear and concise view of the project timeline, enabling project managers to make informed decisions and keep the project on track. Whether you are new to project management or an experienced professional, an Arrow diagram is a valuable tool to have in your arsenal.

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Sachin Naik

Passionate about improving processes and systems | Lean Six Sigma practitioner, trainer and coach for 14+ years consulting giant corporations and fortune 500 companies on Operational Excellence | Start-up enthusiast | Change Management and Design Thinking student | Love to ride and drive