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Saurabh Chandak
Mechanical Engineering
CDSE6/10/2012 1
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Contents
• Understanding Six Sigma
• History of Six Sigma
• Six Sigma Methodologies & Tools
• Roles & Responsibilities
• Practical Insights
• Cost Benefit Analysis
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Six Sigma – Basic Terminology
• The term " Sigma " is used to designate the distribution or
spread about the mean (average) of any process or procedure.
• For a business or manufacturing process, the sigma value is a
metric that indicates how well that process is performing.
• The higher the sigma value, the better. Sigma measures the
capability of the process to perform defect-free-work.
• A defect is anything that results in customer dissatisfaction.
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Overview of Six Sigma
It is a Philosophy
Anything less than ideal is an opportunity for improvement
Defects costs money
Understanding processes and improving them is the most efficient way to achieve lasting results
It is a Process
To achieve this level of performance you need to:
Define, Measure, Analyse, Improve and Control
It is Statistics
6 Sigma processes will produce less than 3.4 defects per million opportunities
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Measuring Process Performance
The pizza delivery example .• Customers want their pizza
delivered fast!
• Guarantee = “30 minutes or less”
• What if we measured performance and found an average delivery time of 23.5 minutes? On-time performance is great, right?
Customers must be happy, right?
Customers do not feel averages!6/10/2012 6
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How often are we delivering on time?Answer: Look at the variation!
• Managing by the average doesn’t tell the whole story. The average and the variation together show what’s happening.
s
x
30 min. or less
0 10 20 30 40 50
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Reduce Variation to Improve PerformanceHow many standard deviations can you “fit” within customer
expectations?
• Sigma level measures how often we meet (or fail to meet) the requirement(s) of our customer(s).
s
x
30 min. or less
0 10 20 30 40 50
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Performance Standards
2
3
4
5
6
308537
66807
6210
233
3.4
DPM
69.1%
93.3%
99.38%
99.977%
99.9997%
Yield
Process
performance
Defects per
million
Long term
yield
World Class
The Sigma value indicates how often defects are likely to occur.
The higher the sigma value, the less likely a process will produce
defects.
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Putting Six Sigma in Perspective!
• Airline passenger safety ~ 8.2
– Currently at 2.6 DPMO (incidents per million
takeoffs and landings)
• Airline baggage handling ~ 3
Six Sigma quality (< 3.4 DPMO).
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Contents
• Understanding Six Sigma
• History of Six Sigma
• Six Sigma Methodologies & Tools
• Roles & Responsibilities
• Practical Insights
• Cost Benefit Analysis
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History of Six Sigma
2002199519921987
Motorola
Allied Signal
General Electric
Johnson & Johnson,
Ford, Nissan,
Honeywell, Cummins
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Six Sigma
Methods Production
DesignService
Purchase
HRM
Administration
QualityDepart.
Management
M & S
IT
Where can Six Sigma be applied?
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Six Sigma Companies
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Contents
• Understanding Six Sigma
• History of Six Sigma
• Six Sigma Methodologies & Tools
• Roles & Responsibilities
• Practical Insights
• Cost Benefit Analysis
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Six Sigma: Changing the Decision-Making Process
Decision-Making
Growth Path
Types of Problems
You Will Normally Solve
1. Intuition, gut feel, I think …
2. We have Raw Data and look at it.
3. We make graphs/charts of the
data.
4. We use advanced statistical tools
to evaluate the data.
Simple
Complex
• Six Sigma is a data-driven (not intution) method that we use to improve the performance of our products and processes in any functional area
• A team based approach to solving complex problems
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DMAIC - simplified
• Define
– What is important?
• Measure
– How are we doing?
• Analyze
– What is wrong?
• Improve
– Fix what’s wrong
• Control
– Ensure gains are maintained to
guarantee performance
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Define
DDefine
MMeasure
AAnalyze
IImprove
CControl
VoC - Who wants the project and why ?
The scope of project / improvement (SMART Objective –Specific, Measurable, Achievable, Relevant, Timely )
Key team members / resources for the project
Critical milestones and stakeholder review
Budget allocation6/10/2012 20
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Measure
Ensure measurement system reliability
Collect data
As-is Process mapping
- Is tool used to measure the output variable flawed ?
- How many data points do you need to collect ?
- How many days do you need to collect data for ?
- What is the sampling strategy ?
- Who will collect data and how will data get stored ?
DDefine
MMeasure
AAnalyze
IImprove
CControl6/10/2012 21
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Analyze
Reduce the number of KPIVs by applying various tools
Don’t focus on symptoms, find the root cause
Conduct DOE to finalize KPIVs
DDefine
MMeasure
AAnalyze
IImprove
CControl6/10/2012 22
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Improve
Present recommendations to process owner.
Pilot run- Formulate Pilot run.
- Test improved process (run pilot).
- Analyze pilot and results.
Develop implementation plan.
- Prepare final presentation.
- Present final recommendation to Management Team.
DDefine
MMeasure
AAnalyze
IImprove
CControl6/10/2012 23
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Control
Don’t be too hasty to declare victory.
How will you maintain to gains made?
- Change policy & procedures
- Change drawings
- Change planning
- Poka Yoke
- Training
DDefine
MMeasure
AAnalyze
IImprove
CControl
Knowledge Sharing, Six Sigma Database
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The Funneling Effect
Critical Input Variables
30+ Inputs
8 - 10
4 - 6
3 - 4
Found Critical X’s
Controlling Critical X’s
10 - 15
All X’s
1st “Hit List”
Screened List
MEASURE
ANALYZE
IMPROVE
CONTROL
• Process Maps
• Failure Modes and Effects Analysis
• Capability Studies
• Design of Experiments (DOE)
• Control Plans
• C&E Matrix, FTA
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Contents
• Understanding Six Sigma
• History of Six Sigma
• Six Sigma Methodologies & Tools
• Roles & Responsibilities
• Practical Insights
• Cost Benefit Analysis
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• Green Belt – Applies quality and statistical tools; drives continuous improvement; 20-40% time allocation to Six Sigma; completes minimum 3 projects for certification
• Black Belt – 100% dedicated to Six Sigma, develops teams; known as a change agent; completes minimum 5 projects in 2 years for certification
• Master Black Belt – Conducts belt training, coaches, mentors, ensures project achievement; known as an expert in Six Sigma; 2 year program
Six Sigma Roles: Belts
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Six Sigma
Projects
MBBs
• Technical Conscience
• Project Reviews
• Mentor Belts
• Assist Local LeadersBelts
• DMAIC/DFSS
• Lead Teams
• Types: Green & Black
Sponsors
• Complete the Charter
• Break Barriers
• Select the Team
• Review Projects
• Meet Weekly with Belt
Local
Leaders
• Establish Business Goals
• Select Projects
• Establish Project Priorities
• Select Belts
• Conduct Reviews
• Verify Savings (Controller)
• Audit Control Plans
BU
Quality
Champs
• Ensure Six Sigma Standards
are followed
• Monitor Six Sigma Measures
• Assist BU leadership
Process
Owner
• Control Plan Ownership
Well Supported Team Structure
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Project
Hopper
Experienced
Belt
Selected
Project
New
Belt
Six Sigma
Training
Master Black
Belt &
Sponsor
Team
Statistical
Tools
Six Sigma
Process
Solution
and
Control
Plan
Flow of a Typical Six Sigma Project
• Hopper – Database that holds potential projects; all projects must
pass through the hopper and be evaluated by the company’s
management, in advance
• Duration - Parameters allow a 4-6 month duration (DMAIC) or a 6-9 month duration (DFSS ) for a project to be completed
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Project Tracker Revision 5 Project Start Date: 1/21/2004 Project Type
Data Collection
Plan for "Y"
Develop Project
Schedule Launch Charter
Improvement
DefineIdentify 'Y" and
draft charter
Charter
Approved
Process Map
C & E Matrix or
FTA
30 Day MBB
Review
Preliminary
FMEA or FTA MSA
Data Collection
Plan for Key
"Xs" MBB Review
Measure
1/21/2004 2/4/2004 2/11/2004 2/25/2004 3/9/2004 3/9/2004 3/9/2004
Initial Capability
Study Multi-Vari MBB Review
Contract
Approval
Analyze
3/22/2004 4/15/2004 4/15/2004 4/15/2004 4/15/2004Single or Multi
Factor Tests
(DOE) MBB Review
Improve
5/31/2004 5/31/2004 5/31/2004
Control Plan
Final Capability
Study
Final FMEA
Revised RPN MBB Review
Final Project
Presentation &
Report
Project Sign-off
& Closure
Control
6/21/2004 6/29/2004 6/29/2004 7/5/2004 7/9/2004 7/9/2004 7/19/2004
(Use as required) VOC/VOB
Requirements
Analysis
Process
Redesign Solution Design
Redesign
Enter Start Date Here
Redesign map is calculated separately
with no dependencies on other block
dates
Improvements
Defined
Project Hopper and Sponsor Role
Review 6 Sigma
Databases
for like projects
Improvements
Implemented
Hand Off
Training/Process
Owner Sign-off
Actual completion
date
Planned
completion date
Legend
2/1/02002
2/3/02Completion
check
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Contents
• Understanding Six Sigma
• History of Six Sigma
• Six Sigma Methodologies & Tools
• Roles & Responsibilities
• Practical Insights
• Cost Benefit Analysis
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Use common sense – Some tools
may not be applicable to your project
ears
neck
feet
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Don„t set too ambitious deadlines
Deadline is dead line !
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On-line help can be useful but
practical experience is must
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Why Six Sigma Works• Team approach – Operator/process owner involvement, opinions
are heard, democratic approach. Unlike Head or MD taking
decisions without consulting the middle management/process
owners
• Respect - understanding human nature
• Well defined focused approach
• Visibility to top management - an increased emphasis on strong and
passionate management leadership and support.
• A special infrastructure of "Champions," "Master Black Belts,"
"Black Belts," "Green Belts", etc. to lead and implement the Six
Sigma approach.
• Fresh set of eyes
• Data driven decision making – effective statistical tools.6/10/2012 35
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Harvesting the Fruit of Six Sigma
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Sweet Fruit
Design for Six Sigma
Bulk of Fruit
Process Optimization
Low Hanging FruitBasic Tools
Ground FruitLogic and Intuition
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Types of Savings
Hard Savings:
Cost ReductionEnergy Saving
Raw Material saving
Reduced Rejection, Waste, Repair
Increased Revenue Increased production
Reduced cycle time
Quality Improvement
Cash flow improvementReduced cash tied up in inventory
Cost and Capital avoidanceReduced maintenance/rework costs
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Types of Savings
Soft Savings:
Customer Satisfaction / Loyalty
Employee Satisfaction
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Cost of Six Sigma Project
Direct Payroll
Full time (Black Belts, Master Black Belts)
Indirect Payroll
Time by executives, team members, data collection
Training and Consulting
Black Belt course, Consultant charges etc.
Improvement Implementation Costs
Installing new solution, IT driven solutions etc.
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References……
• The Six Sigma Way (ISBN 0-07-135806-4) by Pande,
Neuman, and Cavanaugh
• The Power of Six Sigma (ISBN 0-7931-4434-5) by Subir
Chowdhury
• Six Sigma (ISBN 0-385-49437-8) by Harry and Schroeder.
• The Six Sigma Handbook (ISBN 0-07-137233-4) by Pyzdek is
more technical and becoming the 'handbook' for Black Belts.
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Thanks
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