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      • Six Sigma : Define : 4 : Map Process 5 Refine Project Scope
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      • Six Sigma: Measure : 1 Identify Measurement and Variation
      • Six Sigma: Measure : 2 Determine Data Type
      • Six Sigma: Measure : 3 Develop Data Collection Plan
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      • Six Sigma: Measure : 5 Perform Capability Analysis
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      • Six Sigma Analyze : 1 Measuring and modeling the relationship between Variables
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      • Six Sigma Analyze : 4 Analysis of Variance (ANOVA)
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​CTX (Critical to X) Quality

Resource:  Critical Requirements CTQ (Critical to Quality) COQ (Cost of Quality) CTD (Critical to Delivery)) CTP (Critical to Process) CTQ Flow Down
Critical Requirements
There are other types of critical requirements for Six Sigma projects, called CTX (Critical to X) requirements, here is a list.
Critical to X can be of different type which fit your need. Some may be CTQ (Critical to Quality) COQ (Cost of Quality) CTD (Critical to Delivery)) CTP (Critical to Process)
CTQ (Critical to Quality)
CTQ improvement projects may include:
•Simplifying product designs
•Aligning product designs with customer requirements
•Meeting current market place quality levels
•Exceeding current market place quality levels
•Exceeding reliability and maintainability requirements
•Exceeding product appearance expectations
•Meeting technical requirements
•Providing products that are more durable
COQ (Cost of Quality)
COQ improvement projects may include:
•Reducing internal rejections
•Reducing external rejections
•Minimizing salvage and sorting operations
•Reducing warranty claims
•Reducing product variation
•Reducing process variation
•Reducing various forms of waste
•Eliminating unnecessary inspections
CTD (Critical to Delivery))
CTD improvement projects may include:
•Providing exact amounts of products
•Providing service within a specific time interval
•Ensuring immediate response to customer questions
•Providing a product or service on the proper day and time
•Providing more rapid field service
•Providing cost effectiedelivery methods
•Meeting customer packaging requirements
•Minimizing shipping damage
CTP (Critical to Process)
CTP improvement projects may include:
•Designing products that are easier to assemble
•Minimizing the changeover times
•Reducing in-process inventories
•Minimizing product touch times
•Optimizing work cell design
•Streamlining internal work flows
•Reducing process flow variation
•Enhancing process velocity
•Eliminating redundant operations
•Maximizing product yields
•Speeding up operations
•Reducing cycle times
•Minimizing equipment downtime
•Maximizing preventative maintenance
•Performing value stream mapping


CTQ Flow Down
Select Y’s (CTQ’s)
Decompose Yi into contributing elements, yi
Decompose yiinto contributing elements xi, n
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  • Home
  • Six Sigma Wiki
    • History of Six Sigma : The Guru’s
    • Lean vs Six Sigma
    • What is Six Sigma ? Objectives Fundamental Beliefs Benefits
    • Six Sigma Project Overview >
      • Six Sigma Process Performance Metrics
      • Project Execution : Selection , Flowchart , Management , Evaluation
      • Voice of the Customer (VOC) >
        • CTX (Critical to X) Quality
        • Kano Model
        • Different type of Quality Cost
      • Risk Analysis SWOT (Strength, Weakness, Opportunity, Threat)
    • Six Sigma Team Management : Types, Roles, Size, Stages & Life cycle >
      • Six Sigma Organizational Infrastructure Team Leadership >
        • Six Sigma Roles and owners process
        • 3 levels of business management process
        • Six Sigma Training: Black vs Green Belt
        • Overview of DMAIC : Key points
      • Six Sigma Team Tool: Facilitation & Groupthink
      • Nominal Group Techniques Multivoting Force Field Analysis Brainstorming
      • Diagrams : Affinity Tree PDPC Matrix Interrelationship Prioritization matrices Activity network diagram
      • The 4 Stages of Team Growth & Human factor: Forming, Storming, Norming, and Performing
    • Six Sigma: Define Phase : Outcomes & 6 Element >
      • Six Sigma Define: 1Define Problem & 2 Identify Customer
      • Six Sigma : Define : 3 : Identify CTQs ( VOC Kano Model )
      • Six Sigma : Define : 4 : Map Process 5 Refine Project Scope
      • Six Sigma : Define : 6 Update Project Charter ( PERT CPM Gantt Bar WBS)
    • Six Sigma: Measure Phase : Outcomes & 5 Element >
      • Six Sigma: Measure : 1 Identify Measurement and Variation
      • Six Sigma: Measure : 2 Determine Data Type
      • Six Sigma: Measure : 3 Develop Data Collection Plan
      • Six Sigma: Measure : 4 Measurement System Analysis & Data Collection
      • Six Sigma: Measure : 5 Perform Capability Analysis
    • Six Sigma: Analyze Phase : Outcomes & 4 Element >
      • Six Sigma Analyze : 1 Measuring and modeling the relationship between Variables
      • Six Sigma Analyze : 2 Hypothesis Testing
      • Six Sigma Analyze : 3 Failure mode and effects analysis (FMEA)
      • Six Sigma Analyze : 4 Analysis of Variance (ANOVA)
    • Six Sigma: Improve Phase : Overview & 6 Element >
      • Six Sigma: Improve Phase : 1 About Design of experiments (DOE)
      • Six Sigma: Improve Phase : 2 DOE Process variables & Analysis
      • Six Sigma: Improve Phase : 3 Design Selection Guideline
      • Six Sigma: Improve Phase : 4 : Lean 5S
      • Six Sigma: Improve Phase : 5 Poke Yoke
      • Six Sigma: Improve Phase : 6 Standard Work & Kaizen
    • Six Sigma: Control Phase : Overview & 3 Element >
      • Six Sigma: Control Phase : 1. Statistical Process Control
      • Six Sigma: Control Phase : 2. Control Chart
      • Six Sigma: Control Phase : 3. Other: Pre-control Technique, TPM & Visual Management
  • Lean Wiki
    • History of Lean & Guru’s >
      • Birth of Lean
    • About Lean, Value, Waste, Muda, Mura & Muri >
      • Overview Lean Tools, Techniques & House of Lean
      • Lean Excellence, Tools & Framework
      • Lean Framework 6 points, metric & Stability
    • Lean Team Setup : Structure, Meeting & Project >
      • Self Directed Work Teams (SDWT) , ACHIEVE TEAM SYNERGY , SQDCM, Teamwork Principles, Team Structure & Team Leader
      • The 4 Stages of Team Growth & Human factor: Forming, Storming, Norming, and Performing
    • Lean Process Mapping: Generic & Type >
      • SIPOC: Suppliers, Input, Process, Output & Customers
      • Lean Process Management , Excellence , Identification , Design & Mapping
      • Lean Process Mapping Symbols
      • How to Create a Simple Process Flow Diagram
      • Lean Value Stream Mapping, current, future & 3 type of work
      • Value Stream Mapping (VSM): About & 17 steps
      • Other Types of Process Maps & Pitfalls: Resources: iDef0, Document Map, Work Diagrams, Rendered Process Map
    • Lean Process Optimization , Andon System , Error Proofing ( Poka Yoke ) & Defect vs Errors >
      • Lean 5S System
      • Kanban : Benefits, Shapes of Inventory, Type, Operation & Sizing
      • Cellular Manufacturing: About, Benefits & 4 Dimensions of Cells
      • Heijunka, A 3 Thinking, Hoshin planning, Jidoka, Poka‐yoke , Kanban, Takt , Kaizen
      • Lean Kaizen (continuous improvement), Systems Thinking & Process Variability
      • Lean Visual Management & Visual Control
      • Lean Waste Detail: Eight Types of Waste
      • Line Balancing, Cycle Time, Takt Time, Assembly / Workload Balance & Man – Machine – Setup – Time
      • Single Piece Flow, Continuous Flow & Standardized Work
      • SMED Single Minute Exchange of Dies
      • Total Productive Maintenance (TPM): Preventive Maintenance Corrective Maintenance Inbuilt Maintenance
  • Blog
  • Contact