Identifying and eliminating waste is a key part of lean thinking and TPS. While the wastes can differ slightly by an organization, they are generally accepted as intellect, waiting, overproduction, rejects/defects, motion, processing, inventory, and transportation. While eliminating all waste is good, CI engineers need to eliminate waste that can create a direct cost reduction in the workplace. There are many ways to reduce waste, so there are many good ways to answer this question. This is a good time for the candidate to reiterate their ability to engage others, make improvements, and express their CI/kaizen mindset.