Primavera P6 Training || Activity Relationships Explained | FS, SS, FF, SF & Lag

Activity relationships are what bring a Primavera P6 schedule to life.

In this video, I explain Activity Relationships in Primavera P6, showing how activities depend on each other, how logic controls schedule dates, and how the critical path is formed.

This session provides a clear, practical understanding of relationships so planners can build realistic, reliable schedules and avoid common planning mistakes.

🔍 What you’ll learn in this video:

What an Activity Relationship is in Primavera P6

Why relationships are critical for:

Schedule dates

Critical path

Float and delay analysis

Understanding Predecessors and Successors

The golden rule of logic (avoiding open-ended activities)

The 4 relationship types explained with examples:

Finish to Start (FS)

Start to Start (SS)

Finish to Finish (FF)

Start to Finish (SF)

How and when to use Lag correctly

Common planning mistakes to avoid:

Too many lags

Incorrect SF usage

Overuse of SS relationships

Using constraints instead of logic

Understanding activity relationships helps planners:
✔ Build logic-driven schedules
✔ Identify a true critical path
✔ Perform accurate delay analysis
✔ Improve programme credibility

🎯 Good logic = good planning.

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⚠️ Disclaimer

The content on The Planner’s Way is provided for educational and informational purposes only.
It is not intended as professional, financial, legal, or medical advice.

While we share planning concepts, tools, and frameworks, every project and organisation is different. Viewers are encouraged to use their own judgment and seek professional guidance where appropriate.



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