# Mura

**URL:** https://kaizumi.com/dictionary/mura

**Description:** Mura refers to unevenness or inconsistency in processes that causes waste and makes work unpredictable.

**Japanese:** 斑 (mura) — "unevenness, irregularity"

**Category:** lean-principles

**Tags:** flow, foundational

## Definition

Mura is the Japanese term for unevenness, irregularity, or inconsistency in processes. While muda focuses on waste, mura addresses the variation that causes waste. Uneven workloads create periods of overburden (muri) followed by periods of underutilization, both of which generate muda. Mura appears in demand patterns, production scheduling, work distribution, and process execution. Addressing mura through leveling (heijunka) creates stability that enables continuous improvement and reduces all forms of waste.

## Examples

### Manufacturing

> A manufacturer experienced wild swings in production—running overtime three days then having idle capacity two days. This mura resulted from processing orders in the sequence received rather than leveling the mix. Implementing heijunka smoothed production, reduced overtime 60%, and improved delivery reliability.

### Healthcare

> A surgical department scheduled all complex procedures on Mondays and Tuesdays, creating staff overload early in the week and underutilization later. This mura led to errors during peak times and wasted capacity during slow times. Leveling case complexity across the week improved both safety and resource utilization.

### Administrative

> A finance team experienced month-end crunches followed by slow periods, causing stress, errors, and overtime. By shifting some reporting to weekly cadences and spreading reconciliation throughout the month, they reduced mura and improved accuracy while eliminating most overtime.

## Key Points

- Mura often causes both muda (waste during slow periods) and muri (overburden during peak periods)
- Addressing mura at the source—through leveled scheduling—is more effective than reacting to peaks and valleys
- Variation in processes (inconsistent methods) is also mura and leads to quality and efficiency problems
- Stable, leveled operations provide the foundation for continuous improvement

## Common Misconceptions

**Mura is only about demand variation.** While demand unevenness is common, mura also includes variation in how work is performed, equipment reliability, and supply consistency. All forms of unevenness create waste and should be addressed.

**The solution to mura is more capacity.** Adding capacity to handle peaks leaves resources idle during normal periods. The lean approach levels demand to match capacity rather than building capacity to handle worst-case peaks.

## See Also

- [Heijunka](/dictionary/heijunka) - The practice of leveling to address mura

Source: https://kaizumi.com/dictionary/mura
Licence: free to quote and cite with attribution to Kaizumi.