On June 6, 51-year-old welder Quoc Le died at a railcar assembly plant in Hamilton, ON, Canada, after a 1-ton bulkhead fell on him. Shockingly, it was the third fatal accident at the factory, which is owned by National Steel Car, in the past 21 months.

While assembly work has always been physically demanding, little is known about the overall consequences of cognitive loading on assemblers' performance, well-being, and the speed and quality of production. Cognitive under- or overloading can cause a lack of focus or distraction on one hand, or overwhelm on the other.