Heijunka: The Leveling Art of the Japanese Auto Industry

Heijunka (Japanese for "production smoothing or leveling") is a foundational Lean manufacturing technique designed to optimize operations and eliminate waste. Instead of reacting to highly unpredictable, shifting customer orders, Heijunka takes the total order volume over a specific period and distributes it evenly. The result is a steady, predictable daily output of both production volume and product mix.

By finding and maintaining this optimal average, Heijunka stabilizes your entire supply chain—from upstream suppliers to downstream assembly lines.

Why Implement Heijunka?

Facilitates Just-In-Time (JIT): Creates a predictable rhythm that allows materials to arrive exactly when needed.

Reduces Inventory Waste: Eliminates costly overproduction and massive warehouses of unsold safety stock.

Optimizes Takt Time: Aligns daily production speed perfectly with real-world customer demand.

Boosts Satisfaction: Protects employees from sudden, stressful production spikes while ensuring customers receive reliable, on-time deliveries.

This book provides a comprehensive, step-by-step guide to mastering and implementing Heijunka to transform your operations.

About the Author: Written by Lean expert Dr. MHA Soliman, a Lecturer in Industrial Engineering and Management Systems at The American University in Cairo. Dr. Soliman is an Executive Advisor and Advisory Committee member for the IEOM International Society. He brings decades of academic and consulting experience to his work. Today, he is recognized as a leading authority on organizational performance, institutional transformation for total quality systems, and public service optimization.