Value Stream Mapping (VSM) Methodology
A Value Stream Map is a visual blueprint that details every operational task, material flow, and information delay required to deliver a product or service from supplier to customer. Used in Lean manufacturing and healthcare to isolate and eliminate non-value-adding waste.
Stream Study Overview
Analysis Metrics Targets
Standard Value Stream Map Symbols
Identifies external suppliers feeding material, and the customer dictating Takt Demand rate.
Defines a workstation or department where processing tasks (C/T, C/O) occur.
Represents waiting stock or backlog queues between steps. This converts directly into NVA lead time.
Denotes shipping truck schedules and material transfer routes from suppliers and to customers.
Step 1 Map Stream Processes & Inventory
Input the detailed metrics for each step. Enter processing cycle times (C/T), changeover times (C/O), staffing levels, and the inventory or queue volumes observed between steps.
Global Stream & Customer Settings
Process / Inventory Step Editor
| Seq | Step Description | Cycle Time (C/T) | Changeover (C/O) | Staffing | Uptime (%) | Queue / Inventory | Actions |
|---|
Quick Actions & Report Center
Generate detailed lean improvement suggestions or download the complete PDF analysis report directly.
Step 2 Draw Spaghetti Value Stream Flow
Drag and connect Value Stream Map symbols. Use push arrows, material travel layouts, inventory markers, and electronic networks to map out the information flow lines.
Lean Analysis & Capacity Calculator
Review your Value Stream metrics. Takt Time is evaluated against the bottleneck cycle time, and the process efficiency is computed.
Value Stream Lead-Time Ladder (Timeline Diagram)
The ladder displays Value-Adding (VA) processing times on the lower rungs and Non-Value-Adding (NVA) waiting delays on the upper rungs.
Before vs. Target Value Stream Metrics
| Parameter | Observed Baseline | Target Goal | Gap Status |
|---|---|---|---|
| Customer Takt Time | 60 s | 60 s | Fixed Target |
| Bottleneck Process Cycle Time | 0 s | < Takt Time | - |
| Value-Adding (VA) Time | 0 s | Reduce C/O | - |
| Process Lead Time (PLT) | 0 days | Reduce Stock | - |
| Process Cycle Efficiency (PCE) | 0.03% | > 5.0% | - |
Stream Diagnostic Recommendations
Generate tailored suggestions to lower bottleneck cycle times, improve workcell balance, and transition to a pull system.
Future State VSM Guidelines
Consult rules, optimization theories, and strategies formulated by Lean experts to optimize production pathways.
Shingo & Ohno's Mapping Rules
Supermarket Pull System
Instead of pushing material to downstream processes, insert a supermarket. The downstream process withdraws parts as needed, and the upstream process replenishes only what was withdrawn, cutting storage waste.
Continuous Flow (Cellular Layout)
Link processes in a cellular u-shape layout. This eliminates inventory buffers completely and shifts the lead time of that loop to match VA cycle times exactly.
Pacemaker Workcenter
Schedule only one process in the stream (the pacemaker). All upstream processes pull from this point, while downstream processes run in a continuous flow.
Takt Time Rule
Takt Time is calculated as: \(\text{Takt} = \frac{\text{Net Available Operating Time}}{\text{Customer Demand Quantity}}\). Workcenters must run below Takt time to avoid line stops or backlogs.