Explain one form of waste that ABC may try to reduce in the e-waste factory.

• A. Unnecessary movement
• B. Wasted materials
• C. Waiting time
• D. Energy use

Answer: (C)

Waiting time is a form of waste in Lean thinking because it represents non‑value-adding delays that interrupt the flow of production. In an e-waste factory, once a component is dismantled, sorted, or treated, it should move directly to the next operation. If parts pile up because a machine is down, a batch isn’t ready, or information isn’t available, workers and machines sit idle. This slows throughput, increases lead times, and can raise costs. Reducing waiting time helps maintain a continuous, one-piece flow, lowers work-in-progress, and shortens delivery to customers. Tactics to cut waiting include balancing the line, arranging equipment to support smooth handoffs, and reducing setup times so machines don’t sit idle between jobs. Other wastes like unnecessary movement, wasted materials, and energy use are also important, but waiting time most directly harms the smooth flow of the e-waste process.