waiting waste

**Waiting waste** is the **idle time when people, equipment, or material are stalled between process steps** - it extends lead time without increasing value and usually indicates imbalance or poor coordination. **What Is Waiting waste?** - **Definition**: Non-productive delay caused by missing inputs, unavailable tools, approvals, or information. - **Common Forms**: Operator idle time, machine starvation, queue hold, and decision bottlenecks. - **Measurement**: Queue duration, utilization gap, and process synchronization loss by step. - **Root Drivers**: Uneven workloads, long changeovers, unreliable equipment, and planning disconnects. **Why Waiting waste Matters** - **Lead-Time Expansion**: Waiting directly increases total cycle time and delivery risk. - **Capacity Waste**: High idle loss reduces effective throughput from existing assets. - **Cost Burden**: Labor and overhead continue while no customer value is produced. - **Flow Instability**: Waiting contributes to stop-start behavior and unpredictable output. - **Customer Impact**: Long waits reduce schedule adherence and service reliability. **How It Is Used in Practice** - **Bottleneck Balancing**: Align station capacities and staffing to takt-paced demand. - **Readiness Controls**: Use material, recipe, and tool readiness checks to prevent avoidable stalls. - **Queue Management**: Monitor queue aging and escalate chronic waiting sources daily. Waiting waste is **pure lead-time inflation with no value return** - removing idle gaps is essential for fast and predictable production flow.