Time-scale Schedule Network Diagram

A time-scaled schedule network diagram is essentially a diagram that is used in project management whenever you are scheduling an activity. As such, it can be reduced to even simpler terms in saying that a Time-Scaled Schedule Network Diagram is a “fancy” term that is used whenever someone is talking about a project schedule. However, this diagram does need to be drawn in a rather specific manner in order to be understood by those who are in project management. This manner will show just how the project management team should position the project and how long the activity should take, from the very beginning to the very end of the procedure. Now that you understand what a Time-Scaled Schedule Network Diagram and what information it should include, you should also know that this diagram does need to be drawn in a specific manner. It needs to be drawn in the form of a bar chart. However, there is a very specific type of bar chart you will want to use. It must include a schedule for network logic. As such, all diagrams will be uniform, which is what is desirable so that everyone can understand what is taking place.

When managing projects, scheduling activities is essential to ensuring that tasks are completed on time and resources are utilized efficiently. One tool that helps visualize these schedules is the Time-Scaled Schedule Network Diagram (TSSND). While the term might sound complex, it simply refers to a graphical representation of a project schedule that integrates both activity timelines and logical relationships (dependencies). Let’s break it down into simpler terms and add practical examples to make it clear.

What Is a Time-Scaled Schedule Network Diagram?

Think of a Time-Scaled Schedule Network Diagram as a bar chart that not only shows what needs to be done (activities) but also illustrates how these activities are related in terms of dependencies (e.g., one activity must finish before another can begin). It’s essentially a Gantt chart enhanced with network logic, ensuring all project stakeholders understand the flow and timing of activities from start to finish.

Key Characteristics of a TSSND

1. Time Representation:
   • The horizontal axis represents time (days, weeks, months, etc.).
   • The bars represent activities, with the length of each bar showing the duration of the activity.
2. Network Logic:
   • The diagram includes dependencies (logical relationships like Finish-to-Start, Start-to-Start, etc.), visually connecting activities to show their sequence and impact on the schedule.
3. Clarity:
   • Unlike a simple bar chart, a TSSND includes arrows or lines that make it easier to understand how activities interact.
4. Uniformity:
   • By following a standardized approach, such diagrams are easy to read and interpret by all project team members, ensuring consistency.

Why Use a Time-Scaled Schedule Network Diagram?

• Improved Clarity: Helps all stakeholders understand not just when tasks are scheduled but also how they depend on one another.
• Better Decision-Making: Allows project managers to identify critical paths, delays, and opportunities for schedule optimization.
• Enhanced Communication: Provides a common reference point for teams to discuss the schedule and make adjustments.

Practical Steps to Create a TSSND

1. List Activities: Identify all the activities required to complete the project.
   • Example: For a house construction project, activities might include foundation laying, wall construction, roofing, and painting.
2. Define Dependencies: Determine how activities are related.
   • Example: Wall construction cannot begin until the foundation is laid (Finish-to-Start dependency).
3. Determine Durations: Estimate how long each activity will take.
   • Example: Foundation laying may take 7 days, while wall construction may take 10 days.
4. Draw the Diagram:
   • Use a horizontal timeline.
   • Draw bars for each activity according to their start and end dates.
   • Add arrows to show dependencies.

Example of a Time-Scaled Schedule Network Diagram

Project: Website Development

Visualization:

• On a horizontal timeline, “Requirements Gathering” is represented by a bar starting on Day 1 and ending on Day 10.
• Arrows show the dependency: UI/UX Design cannot start until “Requirements Gathering” is complete, while “Backend Development” can overlap with “UI/UX Design.”
• Testing begins only after “Frontend Development” and “Backend Development” are both complete.

Key Tips for Aspiring Project Schedulers and Managers

1. Master Dependency Types:
   • Finish-to-Start (FS): Activity B starts only after Activity A finishes.
   • Start-to-Start (SS): Activity B starts only after Activity A starts.
   • Finish-to-Finish (FF): Activity B finishes only after Activity A finishes.
   • Start-to-Finish (SF): Rare but useful in complex schedules.
2. Use Scheduling Software:
   • Tools like Microsoft Project, Primavera, or online platforms like Monday.com and Smartsheet can simplify creating TSSNDs.
3. Focus on the Critical Path:
   • Highlight activities that directly impact the project’s end date to ensure timely completion.
4. Review and Adjust Regularly:
   • Keep the diagram updated as activities progress or delays occur.

Common Mistakes to Avoid

1. Overcomplicating the Diagram:
   • Avoid cluttering with unnecessary details; focus on key activities and their relationships.
2. Ignoring Dependencies:
   • Failing to account for dependencies can lead to unrealistic schedules.
3. Not Updating the Diagram:
   • A TSSND is only useful when it reflects the current status of the project.

Final Thoughts

A Time-Scaled Schedule Network Diagram is more than just a “fancy” term for a project schedule. It is a powerful tool that provides a clear, logical view of activities, their durations, and their dependencies. For those aspiring to be project managers or schedulers, mastering this diagram can significantly enhance your ability to plan, execute, and control projects effectively.