Key to Duration Accuracy:
* A specialized industry handbook offers standardized and validated task durations tailored to the specific context of petrochemical plants.
Analysis of Options:
* Option A: General industry publications may lack specificity.
* Option B: Past project schedules provide insight but may not reflect the specific context or updated methodologies.
* Option C: The handbook is most relevant as it is tailored to the specific project type.
* Option D: Cost estimates are useful for budget alignment but not as precise for duration calculation.
PSP Study Guide References:
* The guide advises leveraging validated industry resources for project-specific accuracy in duration estimation.
Conclusion: The correct answer is C, as a specialized industry handbook provides the most reliable and context-specific data for duration estimation.

Position Analysis:
* Activity C (Develop Draft Plans and Specifications) has a duration of 5 months and is preceded by Activity A.
* The diagram positions Activity C incorrectly since it starts simultaneously with Activity B, but Activity C should start after the completion of Activity A.
Cross-Verification:
* Based on the dependencies, Activity C's incorrect positioning violates the logical sequencing rule.
Verification with PSP Guidelines:
Correct logic representation is critical for network diagrams (Ref: PSP Study Guide, Chapter 2A: Logical Sequencing).

Mitigating Late Completion:
* A procurement agent could monitor and expedite long-lead equipment, reducing delivery delays that often affect project timelines.
Evaluation of Other Options:
* A: Hiring a senior project manager may not address the specific issue.
* B: Self-performing may not resolve procurement delays.
* D: Better structural steel drawings relate to design, not equipment delays.
Verification with PSP Guidelines:
PSP emphasizes early identification and mitigation of procurement risks (Ref: PSP Study Guide, Chapter 2B:
Procurement and Supply Chain Management).