Operations & Cost Optimization Framework for Case Interviews (2026)

An operations and cost optimization framework is a structured method for decomposing a company's total costs into categories, benchmarking each against peers, and prioritizing reduction levers by impact and feasibility. These cases appear in roughly 15-20% of MBB interviews, with higher frequency at Bain and Deloitte.

The core skill is cost decomposition. Just as profitability cases decompose profit into revenue and costs, operations cases decompose costs into specific, actionable components. Then you prioritize the levers that deliver the most impact with acceptable risk and implementation effort.

When You'll See Operations Cases

Operations cases appear in several contexts:

• Standalone cost reduction: "The CEO wants to cut costs by 15%. Where do you start?"
• Within profitability cases: The diagnosis reveals costs are the problem, and you need to go deeper.
• PE portfolio optimization: A PE fund wants to improve EBITDA at a portfolio company through operational improvement. (See the full PE Due Diligence Framework for how cost levers fit into investment thesis evaluation.)
• Post-merger integration: After an acquisition, the combined entity needs to capture cost synergies.
• Supply chain disruption: External shocks (tariffs, supply shortages, logistics bottlenecks) require operational response.

The Operations & Cost Optimization Framework

Framework

Cost Optimization Decision Flow

1. 01

   Cost baseline

   Decompose total costs by category and sub-driver

2. 02

   Benchmark

   Compare to peers, historical performance, or best-in-class

3. 03

   Identify levers

   Map cost reduction opportunities by category

4. 04

   Prioritize

   Rank levers by impact, feasibility, and risk

5. 05

   Implementation plan

   Timeline, ownership, and tracking KPIs

Step 1: Build the Cost Baseline

Before cutting anything, you need to know where the money goes. Decompose costs along two dimensions:

By category:

By behavior:

Step 2: Benchmark

Benchmarking tells you whether costs are high because of inefficiency or because of the business model. Compare:

• Peer comparison: How does the client's cost structure compare to similar companies? If competitors spend 25% of revenue on COGS and the client spends 32%, there's a 7pp gap to investigate.
• Historical comparison: How do current costs compare to 2-3 years ago? What changed?
• Best-in-class comparison: What do the most efficient operators achieve? This sets the upper bound for improvement.
• Internal comparison: If the client has multiple plants, stores, or regions, compare performance across units.

Step 3: Identify Levers

The five major cost reduction lever categories:

1. Procurement and Sourcing

• Volume consolidation: Aggregate purchases across business units or geographies to negotiate volume discounts.
• Supplier rationalization: Reduce the number of suppliers to improve leverage and simplify management.
• Competitive bidding: Introduce bidding processes for contracts that were historically single-sourced.
• Specification redesign: Reduce material specifications without affecting quality (e.g., thinner packaging, alternative materials).
• Make-vs-buy analysis: Determine whether to produce in-house or outsource based on cost, quality, and strategic importance.

2. Process Improvement

• Lean principles: Eliminate waste in processes. The seven wastes: overproduction, waiting, transport, over-processing, inventory, motion, defects.
• Automation: Replace manual tasks with technology where the ROI justifies the investment.
• Standardization: Reduce process variation across sites, teams, or products.
• Bottleneck removal: Identify and address the constraint that limits throughput.

3. Supply Chain Optimization

• Network design: Optimize the number and location of warehouses, plants, and distribution centers.
• Inventory management: Reduce carrying costs through better demand forecasting, safety stock optimization, and JIT (just-in-time) practices.
• Transportation optimization: Route optimization, mode shifting (e.g., rail vs truck), and load consolidation.
• Demand planning: Improve forecast accuracy to reduce both stockouts and excess inventory.

4. Labor and Workforce

• Productivity improvement: More output per labor hour through training, process improvement, or technology.
• Workforce planning: Right-size headcount based on workload analysis, not across-the-board cuts.
• Span of control: Reduce management layers where they add cost without value.
• Outsourcing/offshoring: Move lower-value activities to lower-cost locations.

5. Overhead and SG&A

• Real estate optimization: Consolidate offices, renegotiate leases, or adopt hybrid work models.
• Shared services: Centralize back-office functions (finance, HR, IT) to eliminate duplication.
• Technology rationalization: Eliminate redundant software licenses, consolidate platforms.
• Travel and discretionary spending: Often the first and easiest cuts, but limited in total impact.

Step 4: Prioritize with an Impact-Feasibility Matrix

Not all levers are equal. Prioritize using two dimensions:

Impact = annual savings potential in dollars or percentage of cost base. Feasibility = time to implement, capital required, organizational resistance, and execution risk.

Step 5: Build the Implementation Plan

Strong recommendations include:

1. Phased timeline: Quick wins (0-3 months), medium-term initiatives (3-12 months), structural changes (12+ months).
2. Ownership: Who is accountable for each initiative?
3. Investment required: Some cost reduction requires upfront capital (automation, technology, restructuring).
4. KPIs and tracking: How will you measure progress? Define specific metrics for each initiative.
5. Risk mitigation: What could go wrong? How do you prevent cost cuts from degrading quality, service, or employee morale?

Worked Example: Manufacturing Cost Reduction

Case prompt: A mid-size auto parts manufacturer has seen EBITDA margins decline from 14% to 9% over three years, despite stable revenue of $600M. The PE owner wants a cost reduction plan to restore margins to 12% within 18 months.

A. Cost Baseline

Revenue: $600M (stable) Target: Restore EBITDA from 9% ($54M) to 12% ($72M), a $18M improvement.

B. Diagnose the Drivers

The $18M gap comes primarily from:

• Raw materials: +4pp = +$24M (largest driver)
• Logistics: +2pp = +$12M
• Manufacturing overhead: +1pp = +$6M
• These are partially offset by minor savings elsewhere (-$6M)

C. Identify Levers

Raw materials ($24M increase):

1. Supplier consolidation: reduce from 47 suppliers to 20-25 through competitive bidding → estimated $8-10M savings
2. Specification redesign: work with engineering to identify 3-5 components where alternative materials meet quality standards at lower cost → estimated $4-6M savings
3. Volume rebate renegotiation: consolidate purchases quarterly instead of monthly to trigger volume discount tiers → estimated $2-3M savings

Logistics ($12M increase): 4. Network optimization: close 1 of 4 regional warehouses and reroute through the remaining 3 → estimated $4-5M savings 5. Mode shifting: move 30% of non-urgent shipments from truck to rail → estimated $2-3M savings 6. Load consolidation: improve truck utilization from 72% to 85% through better scheduling → estimated $1-2M savings

Manufacturing overhead ($6M increase): 7. Energy efficiency: install variable-speed drives on major equipment, renegotiate energy contracts → estimated $2-3M savings 8. Maintenance optimization: shift from reactive to preventive maintenance program → estimated $1-2M savings

D. Prioritize

Total estimated savings: $24-34M (target was $18M, providing a buffer for execution shortfalls).

E. Recommendation

"I recommend a phased cost reduction program targeting $24-34M in annual savings, well above the $18M needed to restore 12% EBITDA margins. The first phase (months 1-3) focuses on quick wins: volume rebate renegotiation, load consolidation, and mode shifting, delivering approximately $5-8M with minimal investment. The second phase (months 3-12) tackles the largest drivers: supplier consolidation and warehouse rationalization, delivering $12-15M but requiring more organizational effort and $2M of upfront investment. The key risk is that supplier consolidation could temporarily disrupt supply continuity, so I'd recommend a staged approach, renegotiating the top 10 suppliers first before expanding. Track savings realization monthly against a bridge to the $18M target."

Common Mistakes in Operations Cases

1. Recommending across-the-board cuts. "Cut every department by 10%" destroys productive capacity alongside waste. Be surgical.
2. Ignoring implementation costs. Some cost reduction levers require upfront investment. A $5M annual saving that requires $20M capex has a 4-year payback. Factor this in.
3. Forgetting quality and service impacts. Cutting raw material costs by switching to cheaper suppliers might save money short-term but increase defect rates. Always consider second-order effects.
4. No prioritization. Listing 15 cost reduction ideas without ranking them by impact and feasibility isn't a recommendation. Focus on the top 3-5 levers that deliver 80% of the savings.
5. Missing the structural vs cyclical distinction. Are costs high because of structural inefficiency (fixable) or because of market conditions (raw material prices, labor market tightness)? The solutions differ.

Interactive Drills: Operations Case Practice

Test Your Understanding

Test yourself

1 / 3

Question 1 of 3

What's the first step in a cost reduction case?

• ARecommend cutting the largest cost category
• BBuild a cost baseline by decomposing total costs into categories and sub-drivers
• CBenchmark against competitors
• DIdentify quick wins

Related Frameworks

Operations cases connect to several other case types:

• Profitability Framework, when cost is the diagnosis in a profitability case
• Value Chain Framework, for diagnosing where cost leaks occur across the value chain
• M&A Case Framework, for post-merger integration and synergy capture
• Case Interview Examples, including operations-focused worked cases
• Pricing Strategy Cases, the revenue side of the profit equation

Sources and Further Reading (checked February 19, 2026)

• McKinsey Operations Practice: mckinsey.com/business-functions/operations
• Bain Operations Consulting: bain.com/consulting-services/operations
• Deloitte Operations Transformation: deloitte.com/operations
• PrepLounge operations case guide: preplounge.com/en/case-interview-basics/case-cracking-toolbox/identify-your-case-type/operations-case
• Lean Enterprise Institute, seven wastes: lean.org