Resource requiring longest time to produce among the set of activities in a line or cell; determines the flow through the line or cell at market rate.

• A. Milk Run
• B. Materials Handling
• C. Pacemaker
• D. Package-2-Order

Answer: (C)

The key idea is identifying the pacemaker in a line or cell—the operation that takes the longest time to complete a unit. This resource sets the pace for the entire flow because every unit must pass through it, so its cycle time caps the line’s overall output. When demand is matched to market rate, the line should run at the pacemaker’s rate, establishing the takt and cadence for production. If the pacemaker is slow, work accumulates before it and downstream steps wait, so increasing speed on other, faster steps won’t raise overall throughput until the pacemaker is improved. The other options describe activities outside of the bottleneck that governs flow: Milk Run is a routing for collecting parts, Materials Handling refers to moving materials, and Package-2-Order is a make-to-order approach. They don’t determine the line’s pace the way the pacemaker does.