07 May 2020, at 0300 hours, a strange smell engulfed the Gopalpuram. Within a few hours 12 lives were lost. The deadly Styrene gas leaked from an LG Polymers storage tank caused this major disaster.

Investigations showed multiple technical failures lining up: polymerized Styrene build-up in the tank, a non-functioning refrigeration system, absence of automatic inhibitor dosing, a rising exothermic reaction, poor air circulation, over agitation, poor temperature monitoring, lack of remote sensing alarms, and reduced supervision during lockdown.

The leak is a textbook Swiss Cheese Effect. British psychologist James Reason coined this concept in 1990 to explain how system failures occur when many small seemingly insignificant glitches align.

He named it after Swiss cheese because each layer in a system: people, process, equipment, policy behaves like a slice of cheese with holes. These holes represent small flaws or gaps. A failure occurs only when the holes across multiple slices line up, letting a problem slip through every layer. The image of those holes perfectly aligning is what inspired the name Swiss Cheese Effect.

Ravichandra, the production manager at a bearing race components plant, liked to joke that his machines and production system behaved way better than his teenage son. They hardly have let him down. But one Tuesday morning, things went wrong , just in small innocent ways.

At 9:10 a.m., Machine 12 stopped for a tool breakage. The operator, in a hurry, selected the wrong downtime code. Just a minor slip. At 10:25 a.m., the forklift air filter choked, was delayed by ten minutes Just a small wait. At 11:40 a.m., a grinding wheel wobbled and needed dressing, few minutes lost there. At 12 :10, the generator tripped, was restored after 8 min. Line in charge, assumed it was momentary, and moved on.

Individually, none of these felt serious. They were the everyday issues of a busy factory. But by lunch, the quality inspector noticed micro-burrs. By 2 p.m., two machines were idling because upstream parts had jammed the flow. By 4 p.m., Ravi was standing with his arms folded explaining to the VP Operations who was trying to calm down yet another missed delivery to an angry customer on the phone.

Only later did the pattern become clear. When many small lapses ‘holes’ align at the same moment they can combine into catastrophic failure. This was another classic case of Swiss Cheese Effect in play. It is so common in manufacturing, wrong downtime code, a delayed part change, an ignored alert, harmless on their own but dangerous together.

Ravichandra did not want stricter checks or some high end automation. He needed just visibility. Live data closed the holes. Every minute of downtime, every reason, every response was captured. And Leanworx made sure the ‘holes’ never aligned again and production became predicable.