What is Bottleneck Analysis?
Bottleneck analysis identifies the constraining step in a process that limits overall throughput and capacity. Based on the Theory of Constraints, it recognizes that a system can only produce at the rate of its slowest component, making bottleneck identification and resolution the highest-leverage improvement opportunity.
Every process has a bottleneck—the step that takes the longest or has the least capacity. Improving any step that is not the bottleneck will not increase overall throughput. This counterintuitive principle is why many improvement efforts fail: they optimize non-bottleneck steps while the true constraint remains unchanged.
The Theory of Constraints (developed by Eli Goldratt) provides a five-step approach: (1) Identify the bottleneck, (2) Exploit it (maximize its throughput with existing resources), (3) Subordinate everything else to it (align all other steps to feed the bottleneck optimally), (4) Elevate the bottleneck (invest in expanding its capacity), (5) Repeat (find the new bottleneck).
In case interviews, bottleneck analysis appears in manufacturing, service operations, and process improvement cases. If a factory can produce 1,000 units/day but only ships 700, finding the bottleneck tells you exactly where to focus. Common bottlenecks include machine capacity, labor availability, quality inspection, or approval processes.
Real-world example
A hospital emergency department found that the bottleneck was not doctors (who had idle time) but the CT scanner (90% utilization with long queues). Adding a second scanner increased patient throughput by 35% without hiring additional physicians.
Related terms
Throughput
Throughput is the rate at which a system produces its output over a specific period of time. In manu…
Capacity Utilization
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Lean Manufacturing
Lean manufacturing is a production methodology focused on minimizing waste within a manufacturing sy…
Six Sigma
Six Sigma is a data-driven quality management methodology that aims to reduce process variation and …
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