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Operations Cases? McK


I had a recent first round and had two very specific operations Cases, both having to calculate OEE. I've practiced every other case type and even though I passed this round, these through me for a loop as structuring and ideas were on the micro level very different then many of the other cases I've done.

Anyone have any resources for practicing these specific case types?


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Vlad antwortete am 11.12.2017
McKinsey / Accenture / Got all BIG3 offers / More than 300 real MBB cases / Harvard Business School


There are several types of operational cases that you may have:

1) Operational math problems. (e.g. Should we increase the speed of the elevator or just buy a second one? How should we reduce the queues? How should we increase the output of a factory?).


  • Usually, you have to look at the process. Even the most complicated systems have the inflows and outflows

The key concepts that you have to learn:

  • Capacity and utilization (both machine and people)
  • Cycle time, Throughput time, Little's Law
  • How the does lowest cycle time influence the production? (Lead time = cycle time of the slowest process)
  • How can we mitigate the bottlenecks with low cycle time? (Buffer, Parallel process, speeding up)

2) Cost cutting cases


  • What is the cost composition and what are the biggest costs
  • Benchmarking of the biggest costs to find the improvement potential
  • Process improvements to meet the benchmarks
  • Costs and benefits of the proposed initiatives

The key concepts that you have to learn:

  • Internal / external benchmarking
  • Idle time
  • Core processes (usually are optimized) and the supporting processes (usually are cut)
  • Math structures (Frequency of operations * time per operation)
  • Other useful structures (e.g. people - process - technology)

Feel free to reach me for further help with these cases.



Odeh antwortete am 12.12.2017

Can you please clarify what OEE is? Acronyms can mean different things to different people. Thanks.

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