When implementing a just-in-time inventory system for construction materials, what is the primary risk that must be managed?
Correct Answer
C) Supply chain disruptions causing delays
Just-in-time inventory reduces storage costs but increases vulnerability to supply chain disruptions. Any delay in material delivery can immediately impact construction schedules since minimal buffer inventory is maintained.
Why This Is the Correct Answer
CORRECT_ANSWER - Just-in-time (JIT) inventory systems are designed to minimize on-site storage by having materials delivered exactly when needed. While this reduces storage costs and inventory carrying costs, it creates a critical vulnerability to supply chain disruptions. Since there's minimal buffer stock on-site, any delay in material delivery - whether due to supplier issues, transportation problems, weather, or other disruptions - can immediately halt construction progress. This makes supply chain reliability the primary risk factor that must be carefully managed in JIT systems.
Why the Other Options Are Wrong
Option A: Increased storage costs
This is incorrect because JIT actually decreases storage costs, not increases them. The whole purpose of just-in-time delivery is to minimize on-site storage requirements, reducing warehouse space needs, inventory carrying costs, and material handling expenses.
Option B: Higher material unit costs
While JIT may sometimes result in higher unit costs due to smaller order quantities and more frequent deliveries, this is not the primary risk. Many contractors accept slightly higher unit costs in exchange for reduced storage costs and improved cash flow.
Option D: Reduced quality control opportunities
JIT systems don't inherently reduce quality control opportunities. Quality inspections can still be performed when materials arrive on-site. In fact, JIT can sometimes improve quality control by ensuring fresher materials and reducing deterioration from long-term storage.
Memory Technique
Think 'JIT = Just In Trouble' if suppliers are late - no backup inventory means immediate project delays
Reference Hint
Project Management chapter covering inventory management and supply chain coordination
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