Lean Process Improvement

The Three Categories of Waste Eliminating waste is one of the most fundamental goals of Lean. To eliminate it effectively, you first need to recognize it. Lean identifies **three distinct categories of waste**. 1. Muda — The Seven Wastes **Muda** is the Japanese word for waste. Taiichi Ohno originally identified **seven wastes** in production, all of which consume resources without adding value: | Waste | Description | |---|---| | **Overproduction** | Making more than is needed or before it is needed | | **Unnecessary Motion** | Extra physical movement by workers that doesn't add value | | **Surplus Inventory** | Holding more materials or products than required | | **Unnecessary Processing** | Extra steps or effort beyond what the customer requires | | **Excessive Transportation** | Moving materials or products more than necessary | | **Idleness and Waiting** | Time spent waiting for the next step, material, or approval | | **Defects** | Rework, scrap, or mistakes that require correction | 2. Muri — Overburden **Muri** refers to overburdening people or equipment beyond their natural capacity. Muri causes: Safety issues for workers Reliability problems with machines Deteriorating quality in outputs Preventing Muri means designing processes that are realistic and sustainable for the people and equipment involved. 3. Mura — Unevenness **Mura** means unevenness or inconsistency in workload. Sometimes a worker