STAGE 1: Understand the chain
Concept: Inventory connects demand, lead time and service expectations.
Task: Map the supplier-to-customer flow and identify where demand and lead time are measured.
Acceptance: Separate units per day from units per order.

My assumptions:

My work / file link:

My checks and results:

What I changed:


STAGE 2: Model the stock rule
Concept: A reorder point covers expected lead-time demand plus a stated buffer.
Task: Calculate reorder points for the supplied daily demand and lead times.
Acceptance: Label the buffer as an assumption rather than a statistically optimized safety stock.

My assumptions:

My work / file link:

My checks and results:

What I changed:


STAGE 3: Stress the assumptions
Concept: Averages conceal variability and disruptions.
Task: Test a two-day delivery delay and a 25% increase in daily demand.
Acceptance: Show which assumptions change and compare stockout exposure.

My assumptions:

My work / file link:

My checks and results:

What I changed:


STAGE 4: Explain the trade-off
Concept: Service and inventory cost move together.
Task: Recommend a policy, monitoring measure and review trigger.
Acceptance: Discuss excess stock and service risk without claiming an optimal policy from three observations.

My assumptions:

My work / file link:

My checks and results:

What I changed:
