Activity Network Diagram - LSS Glossary

An activity network diagram is a graphical representation of the logical relationships between the activities or tasks that make up a project. It is also known as a “PERT” chart, which stands for “Program Evaluation and Review Technique.” Project managers use Activity network diagrams frequently to help plan, schedule, and control a project’s activities.

Purpose of Activity Network Diagrams

To identify the logical relationships between activities or tasks
To develop a project schedule
To understand the dependencies between tasks
To identify the critical path and potential problem areas in the project schedule
To help identify potential areas for improvement in the project plan

Components of an Activity Network Diagram

Activities or Tasks: Represented by boxes or nodes in the Activity Network diagram, these are the individual steps or actions that make up the project.
Arrows: Represent the logical relationships between activities. They show the sequence in which the tasks must be completed.
Event: Represented by a circle, an event marks the beginning or end of one or more activities.
Activity Durations: The amount of time required to complete each activity.
Critical Path: The sequence of activities that determines the earliest completion date of the project.

Creating an Activity Network Diagram

Identify the project’s activities or tasks.
Determine the logical relationships between the activities.
Develop a project schedule.
Identify the dependencies between tasks.
Identify the critical path.
Identify potential problem areas in the project schedule.
Identify potential areas for improvement in the project plan.

Uses of Activity Network Diagrams

Project planning and scheduling
Identifying the critical path and potential problem areas
Identifying the dependencies between tasks
Identifying potential areas for improvement
Monitoring and controlling project progress

Challenges and Limitations of Activity Network Diagrams

Complexity: Activity network diagrams can be complex to create and interpret, especially for large and complex projects
Data collection and measurement: Accurate data collection and measurement can be time-consuming and costly making Activity Network diagram costly to use
Limited applicability: Activity network diagrams may not be appropriate for all types of projects or organizations
Resistance to change: Activity network diagrams may be met with resistance from employees who are used to traditional methods of project management

Activity network diagrams are a powerful tool for project management. They help identify the logical relationships between activities, develop a project schedule, understand dependencies between tasks, identify the critical path and potential problem areas, and identify potential areas for improvement in the project plan. However, Activity Network diagram can be complex to create and interpret, and may not be appropriate for all types of projects or organizations. Careful consideration should be given to the applicability and feasibility of using activity network diagrams before implementing them.

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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