Why these terms are not interchangeable and how each affects leadership decisions, profit, and capacity.
Productivity and efficiency get used interchangeably in most factories, but they answer different questions. Productivity asks how much output is generated from the resources available. Efficiency asks how well those resources are used relative to a theoretical best case.
A line can be highly efficient - running close to its rated speed with little downtime - while still being unproductive if it's the wrong line, building the wrong mix, or starved of demand. Equally, a line can lift productivity by adding capacity or hours without becoming any more efficient at all.
The distinction matters for leadership because it changes what gets prioritised. Efficiency projects focus on removing waste and downtime within an existing process. Productivity projects focus on increasing total output from the resources already in the building - often the bigger commercial lever.
Most sustainable improvement programmes need both: efficiency work to remove waste in the way a process runs, and productivity work to make sure that waste-free process is also generating the output the business actually needs.