Yamazumi Analysis

Introduction: Yamazumi Analysis

Yamazumi analysis is a Lean management technique used to visualise and balance process steps for greater efficiency. The word yamazumi, meaning “to stack” in Japanese, refers to the stacked bar charts that display each task. This method distinguishes between value-added (VA) and non-value-added (NVA) activities, helping to identify and eliminate waste.

Background

Originating from the Toyota Production System, Yamazumi analysis supports the reduction of the three Lean inefficiencies: Muda (waste), Mura (variability), and Muri (overburden). By making workloads transparent, it enables teams to see imbalances in task distribution and take action to streamline processes.

Key Elements/Features

• Bar charts – Show the time allocated to each task or operator.
• Value-Added vs. Non-Value-Added – Categorisation clarifies which tasks directly benefit the customer.
• Visualisation of Muda, Mura, and Muri – Exposes inefficiencies, bottlenecks, and overburden within workflows.

Applications/Examples

Yamazumi analysis is used in both manufacturing and services:

• Manufacturing – Balancing assembly line tasks across operators.
• Healthcare – Identifying NVA activities in patient flow, such as repeated data entry.
• Logistics – Reducing idle time and unnecessary handling.

A practical example is an assembly line study showing that much time is spent on manual sorting (NVA). By automating this step, lead time is reduced and productivity increases.

Relevance/Impact

The method delivers clear insight into how work is distributed, enabling teams to improve balance, efficiency, and throughput. Benefits include cost reduction, improved productivity, and a stronger focus on customer value. Yamazumi analysis is therefore a key tool for achieving operational excellence in competitive markets.

See also

• Flow
• One Piece Flow
• Heijunka
• Just in Time