Study guide
5.5 SIPOC and Process Mapping
ASQ Certified Six Sigma Black Belt CSSBB
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1 Chapter 1: Introduction & CSSBB Exam Strategy
1.1 CSSBB Exam Format, Scoring, and Testing Windows 1.2 Eligibility, Project Affidavits, Application, and Recertification 1.3 Open-Book Strategy, Reference Materials, and a 16-Week Study Plan
2 Chapter 2: Organization-Wide Planning and Deployment
2.1 Fundamentals of Six Sigma and Lean Methodologies 2.2 Selecting the Right Methodology: DMAIC, DFSS, and Lean 2.3 Business Systems, Processes, and Stakeholder Relationships 2.4 Strategic Planning and Deployment of Six Sigma Initiatives 2.5 Six Sigma Roles and Responsibilities 2.6 Organizational Barriers and Common Causes of Six Sigma Failure 2.7 Change Management: Stakeholder Analysis, Readiness, and Communication
3 Chapter 3: Organizational Process Management and Measures
3.1 Impact of Six Sigma Projects on Customers, Suppliers, and Stakeholders 3.2 Benchmarking Types and Performance Goal Setting 3.3 Performance Measures: Balanced Scorecard, KPIs, KBIs, OKRs, and Line of Sight 3.4 Leading and Lagging Indicators and Performance Dashboards 3.5 Financial Measures: Revenue Growth, Margin, NPV, ROI, and Cost-Benefit Analysis 3.6 Cost of Poor Quality and Hard versus Soft Savings
4 Chapter 4: Team Management
4.1 Team Types and Constraints 4.2 Team Roles, Responsibilities, and Member Selection 4.3 Team Success Factors and Ground Rules 4.4 Motivational Techniques and Overcoming Demotivators 4.5 Stages of Team Development and Conflict Resolution 4.6 Team Communication Plans 4.7 Team Leadership Models: Direct, Coach, Support, and Delegate 4.8 Group Behaviors, Conflict Resolution, and Meeting Management 4.9 Facilitation Techniques and Team Decision-Making Methods 4.10 Team Training: Needs Assessment, Delivery, and Evaluation
5 Chapter 5: Define Phase
5.1 Customer Identification and Segmentation 5.2 Customer Data Collection: Methods, Validity, and Reliability 5.3 Customer Requirements: CTX, CTQ Trees, and Operational Definitions 5.4 The Kano Model and Quality Function Deployment 5.5 SIPOC and Process Mapping 5.6 Business Case Justification 5.7 The Project Charter and the Problem Statement 5.8 Project Scope and Boundaries 5.9 SMART Goals and Project Performance Measurements 5.10 Project Charter Reviews and Toll-Gate Governance 5.11 Project Management Tools: Gantt Charts, Toll-Gate Reviews, WBS, and RACI 5.12 Analytical Tools Used Throughout the DMAIC Cycle
6 Chapter 6: Measure Phase
6.1 Process Flow Metrics and the Hidden Factory 6.2 Process Analysis Tools and Value Stream Mapping 6.3 Types of Data and Measurement Scales 6.4 Sampling Concepts, Methods, and Sample Size for Estimation 6.5 Data Collection Plans and Common Pitfalls 6.6 Gage R&R for Variable Measurement Systems 6.7 Attribute Agreement Analysis and Audit MSA 6.8 Measurement Systems Across the Organization, and Metrology 6.9 Population Parameters, Sample Statistics, and Valid Statistical Conclusions 6.10 Descriptive Statistics: Central Tendency, Dispersion, and Shape 6.11 Graphical Methods for Exploratory Data Analysis 6.12 Probability Concepts, Common Distributions, and the Central Limit Theorem 6.13 Additional Distributions: Hypergeometric, Exponential, Lognormal, Weibull, and Bivariate 6.14 Process Capability and Performance Indices 6.15 Capability Studies, Attributes Capability, Yield Metrics, and Long-Term Capability
7 Chapter 7: Analyze Phase
7.1 The Correlation Coefficient, Its Confidence Interval, and Causation 7.2 Linear Regression and Residual Analysis 7.3 Multivariate Tools: Factor Analysis, Discriminant Analysis, and MANOVA 7.4 Hypothesis Testing Terminology, Errors, and Single-Sample Tests 7.5 Statistical Versus Practical Significance 7.6 Sample Size for Hypothesis Tests 7.7 Point Estimates, Confidence, Prediction, and Tolerance Intervals 7.8 Tests for Means, Variances, and Proportions 7.9 Analysis of Variance 7.10 Chi-Square Goodness-of-Fit and Tests of Independence 7.11 Types of Risk and Failure Mode and Effects Analysis 7.12 Gap Analysis and Root Cause Analysis 7.13 Waste Analysis: The Seven Classic Wastes and Resource Under-Utilization
8 Chapter 8: Improve Phase
8.1 Design of Experiments: Objectives, Terminology, and Effects 8.2 DOE Design Principles: Randomization, Blocking, Replication, and Resolution 8.3 Planning and Evaluating Designed Experiments 8.4 One-Factor Experiments: Completely Randomized, Randomized Block, and Latin Square Designs 8.5 Full Factorial Experiments and Design Selection 8.6 Two-Level Fractional Factorial Experiments and Confounding 8.7 Response Surface Methodology and Optimization 8.8 Waste Elimination: Pull Systems, Kanban, 5S, and Poka-Yoke 8.9 Cycle-Time Reduction: Continuous Flow, SMED, and Heijunka 8.10 Kaizen, Kaizen Blitz, Theory of Constraints, and OEE 8.11 Implementation Planning, Piloting, and Solution Selection
9 Chapter 9: Control Phase
9.1 SPC Objectives, Variable Selection, and Rational Subgrouping 9.2 Control Charts for Variables Data 9.3 Control Charts for Attributes Data 9.4 Short-Run SPC and Moving Average Charts 9.5 Control Chart Analysis: Common Cause, Special Cause, and Run Rules 9.6 Total Productive Maintenance and Visual Controls 9.7 Measurement System Reanalysis 9.8 Control Plan Development and Process Owner Handoff 9.9 Lessons Learned, Documentation, and Training for Sustainment 9.10 Ongoing Evaluation of the Improved Process
10 Chapter 10: Design for Six Sigma (DFSS)
10.1 DFSS Frameworks: DMADV, DMADOV, and Design Transfer 10.2 Design for X (DFX) 10.3 Robust Design, Parameter Design, and Verification 10.4 Tolerance Design and Statistical Tolerancing
5.5 SIPOC and Process Mapping
Key Takeaways Explain This Topic AI
SIPOC (Suppliers, Inputs, Process, Outputs, Customers) provides a high-level, 30,000-foot view of process scope, boundaries, and key interfaces during the Define phase.
Constructing a SIPOC follows a reverse-logical sequence: starting with Process boundaries, identifying Outputs, mapping Customers, defining Inputs, and identifying Suppliers.
Process mapping structures visibility across four hierarchical tiers, from Level 1 SIPOC macro-views down to Level 4 standard operating procedure task instructions.
Swimlane (Cross-Functional) flowcharts assign process steps to functional lanes, revealing inter-departmental handoffs, delay queues, and redundant inspection steps.
Value Stream Mapping (VSM) categorizes process activities into Value-Added (VA), Non-Value-Added (NVA), and Essential Non-Value-Added (ENVA), calculating Process Cycle Efficiency (PCE).
Last updated: August 2026
Process mapping is a foundational activity in Six Sigma DMAIC projects. It translates informal operational assumptions into visual models that define process boundaries, inputs, outputs, handoffs, decision gates, and value-adding steps.
The SIPOC Diagram Framework
A SIPOC (Suppliers, Inputs, Process, Outputs, Customers) diagram is a high-level process map constructed during the Define phase. It establishes project scope and prevents scope creep.
Component Definition Manufacturing Example Service / Administrative Example
Suppliers Entities providing key inputs Raw material vendor, tooling manufacturer Customer, ERP database, sales team
Inputs Materials, information, or resources required Steel coils, CAD specifications, lubricant Completed order form, account credentials
Process High-level sequential steps (5-7 steps) Blanking → Stamping → Heat Treat → Inspection Receive Order → Audit Data → Provision Account
Outputs Physical products, services, or data delivered Formed automotive bracket, quality cert Activated user license, invoice PDF
Customers Internal or external recipients of outputs Assembly line, automotive OEM End-user subscriber, finance dept
Step-by-Step SIPOC Construction Workflow
Name the Process : Define clear start and stop boundary events.
Identify Outputs : List key deliverables generated by the process.
Identify Customers : Map recipients for every output.
Identify Inputs : List raw materials, data, and environmental conditions required.
Identify Suppliers : Map providers for every input.
Define High-Level Process Steps : Outline 5 to 7 sequential action steps using action-verb phrasing.
Process Mapping Hierarchy
Six Sigma practitioners utilize different levels of process maps depending on project phase and depth requirements:
Level 1 (Executive Map / SIPOC) : Macro-level overview showing core value streams (5–7 steps).
Level 2 (Cross-Functional Swimlane Map) : Maps process flow across department boundaries, identifying functional handoffs, decision gates, and operational bottlenecks.
Level 3 (Detailed Process Flowchart) : Micro-level mapping of individual task steps, inputs ( X X X ), outputs ( Y Y Y ), inspection points, and rework loops.
Level 4 (Value Stream Map - VSM) : Lean process map tracking material and information flow alongside operational time metrics (Cycle Time, Takt Time, Changeover Time, NVA Time).
- Detailed Process Mapping & Handoff Analysis
- Flowchart Symbols Standard (ANSI / ISO 5807)
Rectangle : Process step or task.
Diamond : Decision point (requires explicit Yes/No outcomes).
Parallelogram : Input or output document/data.
Oval / Capsule : Terminal start or stop boundary.
Arrow : Flow direction and sequence connection.
Identifying Waste and Friction Points
Functional Handoffs : Transferring work across departments creates delay queues and miscommunication.
Rework Loops : Loops indicating non-conforming items returned for re-processing.
Redundant Inspection : Multiple inspection gates signaling lack of upstream process capability.
Quantitative Process Metrics & Time Analysis
When mapping processes, Black Belts gather quantitative baseline metrics:
1. Process Velocity & Lead Time
Process Lead Time (PLT) : Total elapsed time from process initiation to final delivery: PLT = Work-in-Process (WIP) Exit Rate (Completion Velocity) \text{PLT} = \frac{\text{Work-in-Process (WIP)}}{\text{Exit Rate (Completion Velocity)}} PLT = Exit Rate (Completion Velocity) Work-in-Process (WIP)
Value-Added Ratio (VAR) : VAR = ∑ VA Total Process Lead Time (PLT) × 100 % \text{VAR} = \frac{\sum \text{VA}}{\text{Total Process Lead Time (PLT)}} \times 100\% VAR = Total Process Lead Time (PLT) ∑ VA × 100%
Where ∑ VA \sum \text{VA} ∑ VA represents the sum of value-added processing times.
2. Takt Time vs. Cycle Time
Takt Time ( T k T_k T k ) : The required production pace to satisfy customer demand: T k = Net Available Operating Time Customer Demand T_k = \frac{\text{Net Available Operating Time}}{\text{Customer Demand}} T k = Customer Demand Net Available Operating Time
Cycle Time ( C t C_t C t ) : Actual measured time required for an operator or machine to complete one unit.
If C t > T k C_t > T_k C t > T k : Process is a bottleneck; cannot meet customer demand.
If C t < T k C_t < T_k C t < T k : Process has excess capacity; risk of overproduction.
Value-Added vs. Non-Value-Added Analysis
Every step in a process map must be categorized into one of three classifications:
Value-Added (VA) : Steps that meet three strict criteria:
The customer is willing to pay for the activity.
The activity physically transforms the product or service.
The activity is done correctly the first time.
Non-Value-Added (NVA - Waste) : Activities that consume time or resources without transforming the product or adding customer value (e.g., waiting, sorting, transporting, inspecting, reworking). These must be targeted for elimination.
Required Non-Value-Added (RNVA - Business Non-Value-Added) : Activities that add no direct customer value but are mandatory due to legal, regulatory, safety, or financial compliance requirements (e.g., OSHA safety logging, financial tax auditing). These should be minimized and streamlined.
- Advanced Process Modeling: Swimlane Diagrams & VSM Integration
- 1. Cross-Functional Swimlane Diagrams
While basic flowcharts map sequence, Swimlane Diagrams arrange process steps into horizontal or vertical bands corresponding to functional departments or role titles (e.g., Sales, Purchasing, Quality, Shipping).
Core Advantage : Explicitly highlights cross-departmental handoffs, delay wait times, and decision ownership conflicts.
2. Value Stream Mapping (VSM) Integration
Value Stream Mapping is a specialized Lean process mapping tool that integrates material flow (physical product movement) with information flow (orders, production schedules, ERP signals).
Key VSM Time Metrics
Cycle Time ( C / T C/T C / T ) : Elapsed time between completed units exiting a workstation.
Changeover Time ( C / O C/O C / O ) : Time required to convert a machine from producing one product SKU to another.
Uptime / Availability : Percentage of scheduled operating time a machine is functionally running.
Takt Time : Customer demand rate pace: Takt Time = Available Work Time per Shift Customer Demand per Shift \text{Takt Time} = \frac{\text{Available Work Time per Shift}}{\text{Customer Demand per Shift}} Takt Time = Customer Demand per Shift Available Work Time per Shift
Value-Added Analysis Matrix & Waste Identification
- Process Activity Classification Lean Waste Category (TIMWOOD) Action Strategy
- Machining bracket shape Value-Added (VA) None Optimize cycle time via DOE
- Staging parts in buffer queue Non-Value-Added (NVA) Waiting / Inventory Implement Kanban pull system
Transporting parts between buildings Non-Value-Added (NVA) Transportation Relocate equipment to cellular layout
- Inspection for burrs Non-Value-Added (NVA) Overprocessing / Inspection Mistake-proof upstream tooling
- Reworking non-conforming threads Non-Value-Added (NVA) Defects / Rework Eliminate root cause via DMAIC
- Mandatory OSHA safety logging Required NVA (RNVA) Business Requirement Automate via digital barcode scanning