Author: Taylor Warfield, Former Bain Manager and Interviewer

Last Updated: May 27, 2026

Operations case interviews ask you to figure out how to make a business run better. The four most common types are production optimization, process improvement, cost cutting, and forecasting or capacity planning.

 

You should expect at least one operations case interview in your loop, especially if you are interviewing at firms with strong operations practices. By the end of this guide, you will know exactly how to solve each type.

 

But first, a quick heads up:

 

McKinsey, BCG, Bain, and other top firms accept less than 1% of applicants every year. If you want to triple your chances of landing interviews and 8x your chances of passing them, watch my free 40-minute training.

 

What Changed in 2026?

 

This guide adds a clear comparison of operations cases versus other case types, a list of the firms most likely to ask them, a new section on the key formulas and metrics to know cold, a section on the most common mistakes, six practice prompts, and an updated FAQ.

 

The four-step approaches for each case type remain the same. They have been tightened with more specific examples and tighter logic.

 

What is an operations case interview?

 

An operations case interview is a case that asks you to analyze and improve a company’s internal processes. The focus is on execution rather than strategy, and these cases tend to be more quantitative than other case types.

 

Operations cases cover anything involving how work actually gets done. Examples include manufacturing output, supply chain efficiency, service delivery, procurement, workforce productivity, and process redesign.

 

 

Different firms label these cases differently. McKinsey, for instance, may classify an operations case as a cost reduction, capacity management, quality improvement, or supply chain optimization case. The underlying skills being tested are the same.

 

Which firms ask operations case interviews?

 

Operations cases show up most often at firms with strong operations practices. You should expect them at McKinsey, BCG, Bain, Deloitte, Accenture, Kearney, and Oliver Wyman.

 

You will also see operations cases at boutique firms focused on supply chain, manufacturing, or restructuring. Specialists like Kearney and Oliver Wyman lean especially heavily on this case type because their core consulting work is operations focused.

 

Operations cases come up in business operations and strategy interviews at tech companies too, including Amazon, Uber, and DoorDash. If you are interviewing at any of these firms, an operations case is almost guaranteed to appear somewhere in the loop.

 

How do operations case interviews differ from other case types?

 

Operations cases focus on how a company executes internally. Other case types focus on higher level strategic questions about what the company should do next.

 

The table below shows how operations cases compare to the most common case types:

 

Case type	Primary focus	Typical question
Operations	How work gets done internally	How do we increase throughput, cut waste, or improve quality?
Profitability	Why profits are changing	Why are profits down and how do we fix it?
Market entry	Whether to enter a new market	Should we enter and how?
Growth strategy	How to grow the business	How do we grow revenue, customers, or share?
M&A	Whether to buy or merge	Should we acquire this target?
Pricing	What to charge	What price should we set and why?

 

That said, operations levers often appear inside other case types. A profitability case interview frequently requires a cost cutting analysis, a market entry case might require a capacity build out, and a pricing case will lean on the underlying cost structure.

 

The skills being tested are the same across all case types: structured thinking, hypothesis driven analysis, quantitative reasoning, and clear communication.

 

What are the 4 types of operations case interviews?

 

There are four main types of operations case interviews:

 

• Production optimization

 

• Process improvement

 

• Cost cutting

 

• Forecasting and capacity planning

 

Each type tests a slightly different skill. Production optimization tests whether you can increase output. Process improvement tests whether you can redesign a workflow.

 

Cost cutting tests whether you can prioritize savings. Forecasting and capacity planning tests whether you can match supply to demand.

 

The next four sections walk through exactly how to solve each type.

 

How do you solve a production optimization case interview?

 

A production optimization case asks you to determine how to increase the output of a factory, plant, or operation. These cases test your ability to think in terms of rate, utilization, and capacity.

 

Example: ExxonMobil is looking to expand its oil and natural gas production by 50% over the next five years. What is the best way to achieve this production increase?

 

The two formulas you should know cold are:

 

• Output = Rate × Time

 

• Utilization = Output / Maximum Output

 

Output = Rate × Time

 

The output of a production system equals the rate of production multiplied by time.

 

Example: A machine that makes shirts produces 5 shirts per hour. If the machine runs for 12 hours, it will produce 60 shirts.

 

Utilization = Output / Maximum Output

 

Utilization measures how much a factory or machine is being used relative to its maximum possible output. A facility at 100% utilization is running at its theoretical maximum.

 

Example: A machine can produce 5 shirts per hour, so its maximum daily capacity is 120 shirts. If it is producing only 60 shirts per day, it is operating at 50% utilization.

 

What are the 5 steps to solve a production optimization case?

 

There are five steps to solving any production optimization case.

 

Step 1: Identify and quantify the client’s goals

 

Determine the specific goal the client has. Are they trying to increase production? Are they trying to improve efficiency?

 

Try to quantify an exact target, such as “increase output by 50% over five years.” This number is what you will use to check whether your recommendations are big enough at the end of the case.

 

Step 2: Consider ways to increase the rate of production

 

The first lever is to increase how fast each unit is produced. There are four common ways to do this:

 

• Upgrade or improve existing equipment or machinery

 

• Remove factors that slow down existing equipment

 

• Adopt new technologies

 

• Adopt new production processes

 

Walk through each one systematically before moving on.

 

Step 3: Consider ways to increase utilization

 

The second lever is utilization. Check whether the machines or equipment are being used to their full potential.

 

Are they being operated every working hour? Are there bottlenecks that prevent equipment from running on schedule? Could shift patterns be changed to add more operating hours?

 

Step 4: Consider ways to add capacity

 

The third lever is to add capacity. This means buying more equipment, building more facilities, or hiring more people.

 

In general, you should only add capacity after optimizing rate and utilization. Adding capacity is the most expensive option and may not be necessary if the existing system can be run better.

 

Step 5: Quantify the change in production

 

Add up the impact of all your suggestions and check whether they meet the client’s goal. State your recommendation, give two to three supporting reasons, and propose next steps if you had more time.

 

Quantification is what separates strong answers from average ones. A vague answer like “improvements will be significant” is much weaker than “these three changes will increase output by roughly 55%, which exceeds the client’s 50% target.”

 

If you want to master cases like this quickly, my case interview course walks you through proven step by step methods for every operations case type in as little as 7 days.

 

How do you solve a process improvement case interview?

 

A process improvement case asks you to identify opportunities to improve a specific process. These cases test your ability to break down a workflow, isolate the bottleneck, and prioritize the changes that matter most.

 

Example: Amazon is looking to improve the process by which it receives, handles, and ships customer online orders. How can it improve this process?

 

There are four main steps to solving these cases.

 

Step 1: Identify the most important performance metric

 

Improving a process can mean many different things. It could mean increasing throughput, improving quality, reducing cycle time, or reducing cost.

 

Clarify with the interviewer which metric matters most. Without this, you will not know what you are optimizing for.

 

Step 2: Break the process into distinct components

 

Decompose the overall workflow into separate, distinct steps. A helpful way to think about each step is in terms of inputs and outputs.

 

Each step has something given to it (input), an action that transforms it, and something that comes out (output). Lay out the full chain on paper so you can see where time, money, or quality is being lost.

 

Step 3: Assess People, Process, and Technology for each component

 

Assess the People, Process, and Technology at each step in the workflow. This is known as the PPT framework.

 

• People: Are there enough people in place? Are they properly trained? Are they being managed and motivated effectively?

 

• Process: Are the right steps being performed? Should any be added or removed? Is the order optimal?

 

• Technology: Is the right technology being used? Is it being used effectively? Could automation improve the step?

 

Going step by step through each component prevents you from missing an obvious lever.

 

Step 4: Prioritize and recommend the most important improvements

 

Score and rank each improvement opportunity. The two dimensions to use are impact (how much the change moves the target metric) and ease of implementation (cost, time, and risk).

 

The biggest impact, lowest cost opportunities go first. State your top recommendations, give two to three supporting reasons, and propose what you would investigate next.

 

How do you solve a cost cutting case interview?

 

A cost cutting case asks you to help a client reduce costs by a specific amount. These cases test your ability to break down a cost base, separate critical from discretionary spending, and prioritize what to cut.

 

Example: Airbnb wants to cut costs by $100M to increase profitability. In which areas should it cut costs and by how much?

 

There are five steps to solving any cost cutting case.

 

Step 1: Quantify the client’s cost reduction goal

 

How much is the client trying to cut? $1M? $10M? $100M?

 

The size of the target completely changes the strategy. Cutting $1M might be done through one or two small initiatives. Cutting $100M usually requires structural changes.

 

Step 2: Break costs into components

 

Break the cost base into pieces. Common ways to do this include:

 

• Fixed costs and variable costs

 

• Direct and indirect costs

 

• By geography, business unit, product, or function

 

• By process stage

 

Ask the interviewer which breakdown the client has data on, then use that one.

 

Step 3: Identify business critical expenses

 

Business critical costs are the ones the company cannot operate without. These should not be touched.

 

Examples include core production inputs, regulatory and compliance spending, and core front line staff. Putting these aside up front saves you from wasting time on dead end ideas.

 

Step 4: Work through discretionary spending from largest to smallest

 

The remaining costs are discretionary. These are the costs you will focus on.

 

Work from largest to smallest, since one large cut is usually easier than many small cuts. For each cost element, ask what value it creates, what would break if you reduced it, and how much you could realistically cut without damaging operations.

 

Step 5: Prioritize cuts and recommend

 

Add up the cuts you have identified. Check that the total meets the client’s goal.

 

Deliver your recommendation, give two to three supporting reasons, and flag the most important risks. A cost cutting recommendation should always acknowledge what could go wrong if cuts are too deep.

 

How do you solve a forecasting and capacity planning case interview?

 

A forecasting or capacity planning case asks you to determine how much product to produce or how much inventory to hold. These cases test your ability to estimate demand and weigh the cost of being wrong in either direction.

 

Example: Apple is planning to launch the newest version of its iPhone. How many iPhones should it produce this year?

 

There are four steps to solving any forecasting or capacity planning case.

 

Step 1: Identify the client’s goal

 

What is the client actually trying to maximize? Profit? Revenue? Market share? Customer satisfaction?

 

The right answer changes based on the goal. A company chasing market share will overproduce on purpose to make sure no customer walks away. A company chasing profit will produce more conservatively.

 

Step 2: Estimate customer demand

 

Estimate expected customer demand for the product. There are several ways to do this:

 

• Use historical sales data

 

• Look at the demand curves of similar products

 

• Assess market and competitor trends

 

• Look at customer survey data on purchase intent

 

Your interviewer will usually give you data in one of these areas. Use it to build a reasonable forecast.

 

Step 3: Quantify underage and overage costs

 

Underage cost is the cost of producing too little. Overage cost is the cost of producing too much.

 

Producing too little leads to lost sales, missed customers, and competitors winning your customers. Producing too much leads to storage costs, obsolete inventory, and discounting to clear stock.

 

Knowing the ratio between these two costs tells you whether to plan above or below the expected demand.

 

Step 4: Determine the optimal production or inventory level

 

Combine the demand estimate with the underage and overage cost ratio. If overage costs are high, plan below expected demand. If underage costs are high, plan above it.

 

Set up an equation to find the level that maximizes the client’s goal. State your recommendation, support it with two to three reasons, and propose next steps.

 

What formulas and metrics should you know for operations cases?

 

Operations cases lean heavily on math, so you need to be fluent with a handful of formulas and metrics before walking into the interview. Strong case interview math skills set top candidates apart in operations cases more than in any other case type.

 

The most important formulas and metrics are:

 

Formula or metric	What it measures	Example
Output = Rate × Time	Total units produced over a period	10 units per hour × 8 hours = 80 units
Utilization = Output / Maximum Output	How much of capacity is being used	80 / 100 = 80% utilization
Throughput	Units exiting the system per unit of time	50 orders shipped per hour
Cycle time	Time to produce one unit from start to finish	6 minutes per car at one workstation
Lead time	Total time from customer order to delivery	7 days from order to doorstep
Bottleneck capacity	The slowest step in a process, which sets max throughput	Packing line caps output at 40 units per hour
Break-even units = Fixed costs / (Price − Variable cost)	Units needed to cover fixed costs	$1M / ($10 − $6) = 250,000 units
Inventory turnover = COGS / Average inventory	How often inventory is sold and replaced	$5M / $1M = 5x per year

 

The single most important concept on this list is the bottleneck. The slowest step in any process sets the maximum throughput for the entire system. Improving any other step is wasted effort until the bottleneck is fixed.

 

What are the most common mistakes in operations case interviews?

 

There are six common mistakes candidates make in operations cases.

 

Mistake #1: Jumping to solutions before diagnosing the problem

 

Operations cases reward diagnosis first, solutions second. Candidates who jump straight to ideas like “automate everything” or “cut headcount by 20%” lose credibility fast.

 

Always understand what is actually broken before suggesting fixes.

 

Mistake #2: Skipping clarifying questions

 

Operations cases are unusually sensitive to the client’s exact goal. Are we maximizing throughput? Reducing cost? Improving quality?

 

The same factory looks very different depending on the answer. Ask before you structure.

 

Mistake #3: Ignoring the bottleneck

 

Many candidates spread their analysis evenly across every step in a process. The right move is to focus on the bottleneck, since that is where any real improvement comes from.

 

Mistake #4: Failing to quantify

 

Operations cases are quantitative. Vague answers like “this will improve efficiency” are not enough. State the expected impact in numbers wherever possible.

 

Mistake #5: Forgetting trade-offs

 

Cutting cost often hurts quality. Increasing throughput often increases error rates. Reducing inventory often means more stockouts.

 

Strong candidates flag the trade-offs of their recommendations. Weak candidates pretend the recommendations are free.

 

Mistake #6: Memorizing a single operations framework

 

There is no one-size-fits-all operations framework. The right structure depends on the objective. Strong candidates build a tailored structure for the specific case, and memorized case interview frameworks rarely fit operations problems well.

 

How do you prepare for operations case interviews?

 

There are five things to focus on when preparing for operations case interviews.

 

Tip #1: Get comfortable thinking in systems and processes

 

Train yourself to look at any business as a chain of steps. Walk into a coffee shop and break down the order to cup process. Walk through an airport and break down the check in to boarding process.

 

This skill compounds. The more processes you map mentally, the faster you can structure unfamiliar operations cases.

 

Tip #2: Build your math fluency

 

Operations cases involve more arithmetic than most other case types. Drill mental math, percentages, and ratios until they are automatic.

 

If you stumble on basic calculations during the case, you will not have the bandwidth to think strategically about the problem.

 

Tip #3: Learn to spot bottlenecks fast

 

The bottleneck is almost always the answer. Practice scanning a process and asking “which step has the longest cycle time or the highest utilization?”

 

Tip #4: Practice with industry-specific cases

 

Operations look very different across industries. A factory case is not the same as a call center case, and a hospital admissions case is not the same as a logistics case.

 

Practice cases from a mix of industries so you are not surprised by the context.

 

Tip #5: Get feedback from someone who has done these cases

 

Practicing alone has limits. A coach or peer who has been on the other side of operations cases will spot issues you cannot see in your own work.

 

Practice operations case interview questions

 

Use these case interview examples to practice across all four operations case types:

 

1. A car manufacturer wants to increase its production output by 25% over the next two years without building a new plant. How should it do this?
   
   
2. A regional hospital is taking too long to admit emergency room patients, leading to poor outcomes and lost patients. How should it reduce admission times?
   
   
3. A logistics company is missing its on time delivery target by 15%. What is causing the issue and how should it fix it?
   
   
4. A national restaurant chain wants to reduce operating costs by 10% without affecting customer experience. Where should it cut?
   
   
5. An e-commerce retailer is launching a new electronics category. How many units of the flagship product should it stock for the holiday season?
   
   
6. A coffee chain is seeing wait times double during peak hours. How should it reduce queues without reducing the menu?

 

When practicing each prompt, run through the full step-by-step approach for that case type. Time yourself to 30 to 40 minutes per case.

 

Frequently Asked Questions

 

How long does an operations case interview last?

 

An operations case interview typically lasts 25 to 40 minutes, similar to other case interview formats. McKinsey cases tend to run closer to 25 to 30 minutes, while Bain and BCG cases often run 30 to 45 minutes.

 

Are operations cases harder than strategy cases?

 

Operations cases are not necessarily harder, but they are different. They lean more on math, process thinking, and bottleneck analysis. Candidates with engineering, supply chain, or operations backgrounds often find them easier than strategy cases.

 

Do all consulting firms ask operations cases?

 

Most major firms ask operations cases, but they show up more often at firms with strong operations practices. McKinsey, BCG, Bain, Deloitte, Accenture, Kearney, and Oliver Wyman all use them frequently. Strategy focused boutiques may lean more on market entry, growth, and pricing cases instead.

 

What is the most important formula for operations cases?

 

The two most important formulas are Output = Rate × Time and Utilization = Output / Maximum Output. Together they let you analyze almost any production or capacity question. Knowing them cold means you never lose time deriving them mid-case.

 

What is the PPT framework in operations cases?

 

PPT stands for People, Process, and Technology. It is a way to break down any workflow by asking whether the right people, the right steps, and the right tools are in place at each stage. It is most commonly used in process improvement cases.

 

What is a bottleneck in an operations case?

 

A bottleneck is the slowest step in a process. It sets the maximum throughput of the entire system. Identifying and fixing the bottleneck is usually the single highest-impact action in any operations case, which is why interviewers reward candidates who find it quickly.

 

How can I tell which type of operations case I am being given?

 

Look at the prompt. If the goal is to increase output, it is a production optimization case. If the goal is to redesign a workflow, it is a process improvement case. If the goal is to reduce spend, it is a cost cutting case. If the goal is to decide how much to produce or stock, it is a forecasting and capacity planning case.

 

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