Efficiency is the ability to accomplish a task, process or action with little waste. It is often expressed in terms of how much time or energy is expended to accomplish a task. It is a quantitative measure where we evaluate the magnitude of something and ask questions about how much or how fast. In contrast, effectiveness is a qualitative measure of performance that evaluates degrees of good or bad.
In an operational context, efficiency is a measure of productivity: “As the process became more efficient, production increased dramatically.” Lean and Six Sigma methods attack waste and variation and therefore make processes more efficient and effective.
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