🔍 Understanding the Out-of-Sequence (OOS) Problem
Out-of-Sequence (OOS) progress is one of the most common yet critical scheduling issues in project management. It occurs when activities progress differently from their planned logical sequence, causing:
❌ Incorrect float calculations
❌ Misleading schedule forecasts
❌ Broken relationships between activities
❌ Unreliable critical path analysis
📌 Example: In a traditional Finish-to-Start (FS) relationship, a successor should not start before its predecessor finishes. However, in reality, execution may not follow this rule, leading to OOS dependencies.
💡 Without proper handling, OOS can distort project analytics and affect decision-making.
🛠 How Plannex Solves OOS Automatically!
Plannex’s Out-of-Sequence Solver is designed to detect, analyze, and fix OOS issues seamlessly. Here’s how it works:
🔹 1. Smart Detection of OOS Cases
✅ Scans the entire schedule to identify out-of-sequence relationships
✅ Supports all dependency types: FS, SS, FF, and SF
🔹 2. Automated Fixes for OOS Relationships
Plannex applies intelligent rules to correct each OOS scenario:
📌 Case 1: FS Violation
- Issue: Successor starts before predecessor finishes.
- Fix: Converts FS → FF (Finish-to-Finish) to match actual execution.
📌 Case 2: SS Violation
- Issue: Successor progresses while the predecessor is still not started.
- Fix: Converts SS → FF (Finish-to-Finish) for logical alignment.
📌 Case 3: FF Violation
- Issue: Successor finishes before its predecessor.
- Fix: Converts FF → SS (Start-to-Start) to maintain scheduling integrity.
📌 Case 4: SF Relationship Issues
- Issue: The successor completes before the predecessor even starts (rare but problematic).
- Fix: Removes the SF relationship to avoid incorrect logic.
🔹 3. Detecting New Open-End Activities
📌 Fixing OOS relationships may create new open-end activities (tasks with no logical predecessors or successors).
✅ Plannex automatically flags new open-end tasks so you can review and adjust dependencies before importing to Primavera P6.
🔹 4. Tracking Changes with Comments
📌 Plannex doesn’t overwrite your schedule blindly!
✅ All modifications are commented and logged in the original predecessor sheet (TASKPRED_old) for full traceability.
🚀 Why Plannex?
✔ Fully automated OOS detection & correction – No manual fixes required!
✔ Prevents misleading float values & broken logic
✔ Identifies and tracks new open-end activities
✔ Provides a transparent modification history
✔ Saves time and improves schedule accuracy
📌 And the best part? Plannex OOS Solver is FREE for up to 5000 relationships!
🔗 Download Plannex now and take control of your project schedules!
#Plannex #OOSFix #PrimaveraP6 #ProjectManagement #ConstructionScheduling
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