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Production Planner interview questions and how to answer them

A production planner interview is really a test of how you think when the plan breaks. Expect questions about MRP, capacity and shortages, plus a few scenarios where two people want the same line on the same day. Bring real examples from a real schedule, because vague answers about being organized won't get you far.

11 questions7 minute read

Part 1

1.Walk me through how MRP decides what to order and when.

Why they ask

They want to know you understand the logic behind the screen, not just which button runs it.

How to answer

  • Start from gross requirements coming off the master schedule and exploding through the bill of materials
  • Net against on-hand inventory, open purchase orders and safety stock
  • Offset by lead time to get planned order release dates
  • Mention lot sizing rules and how bad master data, like a wrong lead time, throws the whole thing off

2.A supplier calls at noon and says your key component will ship short tomorrow. What do you do?

Why they ask

This happens constantly. They want to see your first moves and who you tell.

How to answer

  • Confirm the real quantity and new date with the buyer before touching the schedule
  • Check which work orders and customer orders that shortage actually hits
  • Look for substitutes, stock at another site, or jobs you can pull forward to keep the line running
  • Tell production, customer service and your manager the new plan, with the customer impact stated plainly

3.How do you sequence jobs on a line with long changeovers?

Why they ask

Sequencing is where a planner saves or loses real capacity, and it shows whether you know the product.

How to answer

  • Group jobs by shared setups, like color, material or tooling, to cut changeovers
  • Balance that against due dates so you don't make a customer order late to save a setup
  • Talk with the supervisor about which changeovers are actually painful on the floor
  • Give a real example of a sequence you changed and what it freed up
4.How do you check whether the plant can actually build next week's schedule?

Why they ask

They're testing capacity planning. Plenty of planners load a schedule nobody can run.

How to answer

  • Compare required hours by work center against available machine and labor hours
  • Account for planned maintenance, absences and realistic efficiency, not the theoretical rate
  • Flag the bottleneck and plan around it first
  • Say what you do when load exceeds capacity: overtime, moving work, or pushing dates with sales
5.Sales wants to insert a hot order into the frozen zone. How do you respond?

Why they ask

Every plant has this fight. They want to see if you can say no politely, or say yes with the cost attached.

How to answer

  • Find out what the order is worth and what the real deadline is
  • Show what gets bumped, and which customers that hurts
  • Offer options: a partial ship, a later slot, or overtime if someone approves the cost
  • Get the decision made by the person who owns that trade-off, then update everyone

Part 2

6.What do you look at first thing in the morning?

Why they ask

Your routine tells them how you actually run a plan day to day.

How to answer

  • Yesterday's production against plan, and why any jobs missed
  • The shortage report and today's expected receipts
  • Any quality holds or machine downtime reported overnight
  • What you bring to the daily production meeting as a result
7.Tell me about a time your inventory numbers didn't match what was on the floor.

Why they ask

Bad inventory accuracy breaks MRP. They want to know if you find root causes or just adjust the count.

How to answer

  • Describe the specific part and how you found the gap
  • Explain how you traced it, such as unreported scrap, backflush errors or a wrong BOM quantity
  • Say what you fixed in the process, not only the count
  • Mention cycle counting or a check you added so it didn't come back
8.How do you set safety stock for a part?

Why they ask

It shows whether you understand the balance between shortages and cash tied up in inventory.

How to answer

  • Tie it to demand variability and supplier lead time reliability
  • Treat a part with a single unreliable supplier differently from a cheap commodity item
  • Review it regularly instead of setting it once and forgetting it
  • Be honest if your last plant set it by rule of thumb, and say what you'd do better
9.Show me how you'd find the shortages in this spreadsheet.

Why they ask

The Excel exercise. They want to see if you can work data without waiting on IT.

How to answer

  • Set up a clear projected balance: on hand, plus receipts, minus demand, by period
  • Use lookups or a pivot table to join the data rather than copying by hand
  • Flag negative balances and sort them by the date they hit
  • Talk through your reasoning out loud as you build it
10.Tell me about a disagreement with a production supervisor.

Why they ask

You have to get results from people who don't report to you. They want proof you can do it without burning the relationship.

How to answer

  • Pick a real example where the supervisor had a fair point
  • Explain how you listened and what you learned about the floor
  • Show how you reached a plan you both could run
  • Say what changed in how you worked together afterward

Part 3

11.Why do you want to be a planner rather than a buyer or a supervisor?

Why they ask

They want someone who likes the puzzle, not someone using planning as a waiting room.

How to answer

  • Name what you enjoy about seeing the whole flow from demand to shipment
  • Connect it to something you've already done, like building a tracker or fixing a shortage
  • Be honest about where you want to grow, such as master scheduling or S&OP

Questions to ask them

Ask at least two. It shows you're picking them too.

  • How often does the schedule change inside the frozen zone, and who approves those changes?
  • How accurate is inventory in the ERP right now, and who owns cycle counting?
  • What does the daily production meeting look like, and who runs it?
  • Where does the plant lose the most capacity today: changeovers, shortages or downtime?
  • What would make someone in this role a success by the end of their first few months?