Before revision: The take home message from the experiments is that before management adjusts a process -- such as by firing seemingly underperforming employees, or by making physical changes to an apparatus -- they should consider all sources of variation in the process that led to the performance outcome.
After revision: The take home message from the experiments is that before management adjusts a process — such as by firing seemingly underperforming employees, or by making physical changes to an apparatus — they should consider all sources of variation in the process that led to the performance outcome.