You are managing a project where the concrete supplier has reliability issues. Your project schedule shows concrete placement on the critical path with zero float. What expediting strategy should you implement?
Correct Answer
B) Identify backup suppliers and place parallel orders
Since concrete placement is on the critical path with zero float, any delay will impact project completion. Identifying backup suppliers and potentially placing parallel orders ensures schedule protection despite higher costs.
Why This Is the Correct Answer
Option B is correct because when an activity is on the critical path with zero float, any delay directly impacts the project completion date. Since concrete placement cannot be delayed without affecting the entire project schedule, the contractor must take immediate action to secure reliable supply. Identifying backup suppliers and placing parallel orders ensures schedule protection, even though it may increase costs - schedule preservation takes priority over cost control when dealing with critical path activities.
Why the Other Options Are Wrong
Option A: Wait for the supplier to resolve issues to maintain cost control
Waiting for the supplier to resolve issues would cause project delays since this activity has zero float on the critical path. Any delay in concrete placement would push back the entire project completion date, making this approach unacceptable for schedule management.
Option C: Reschedule concrete placement to a later date
Rescheduling concrete placement to a later date is impossible since it's on the critical path with zero float. Moving this activity would automatically delay the project completion date and violate schedule commitments.
Option D: Reduce the concrete order quantity to minimize risk
Reducing the concrete order quantity doesn't solve the reliability problem and may actually create additional delays by requiring multiple deliveries. This approach fails to address the core issue of supplier unreliability affecting the critical path.
Memory Technique
Think 'Zero Float = Zero Tolerance for Delays' - when you see critical path with zero float, immediately look for the answer that prevents any delay, regardless of cost.
Reference Hint
Project Management/CPM Scheduling chapter - Critical Path Method and float calculations
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