Six Sigma Introduction 6 4/13/2015 © 2010 RLM & Associates LLC 1 Six Sigma 4/13/2015 © 2010 RLM & Associates LLC 2 Six Sigma Roles Six Sigma defines a taxonomy of knowledge, skills and ability levels for all members of the organization. Each Six Sigma level has well defined roles and responsibilities for team communications. Executive Deployment Leader Champions Master Black Belts Black Belts Effect: Team members are focused and capable of meeting project needs. Green Belts Yellow Belts All Employees 4/13/2015 © 2010 RLM & Associates LLC 3 Lean Six Sigma Project Roles Project Sponsor Process Owner Black Belt Green Belt Kaizen Leader Leads Medium to Large Projects Leads Smaller Projects and/or Supports Black Belt Projects Facilitates Kaizen Events Financial Rep Validates Project Benefits 4/13/2015 Yellow Belt Team Members Provide Subject Matter Expertise © 2009 RLM & Associates LLC 4 Key Success Factors 1. Executive Support and Engagement 2. Rigorous and Appropriate Project Selection 3. Selecting Projects that Support the Business 4. Metrics Results Focused, Not People Trained! 5. Active Project Sponsorship at Project Level 6. Selection of High-talent Black Belts and Champions 7. Full-Time Dedicated Resources in Key Roles 4/13/2015 © 2009 RLM & Associates LLC 5 What is Six Sigma? What is Six Sigma? A statistical theory that characterizes the total variation at hand in a process in relation to customer requirements or specifications The resulting products or services are 99.9997% defect free Not all business processes need to operate at this level 4/13/2015 © 2010 RLM & Associates LLC 6 Process Capability Process Capability Amount of Variation Effect Too Much Difficult to produce outputs which conform to the customer requirements or specifications Moderate Most output conforms to customer requirements Very Little Almost all output conforms to customer requirements 4/13/2015 © 2010 RLM & Associates LLC Sigma Value Low (0 – 2) Middle (2 – 4) High (4 – 6) 7 Illustration of Six Sigma Comparison of Pizza Delivery Times Company A 4/13/2015 Company B Day Delivery Time Day Delivery Time 1 5:58 1 5:51 2 6:20 2 6:04 3 5:49 3 5:59 4 6:05 4 6:00 5 6:10 5 6:10 6 5:42 6 5:56 7 6:01 7 6:02 8 5:53 8 6:11 9 6:12 9 5:59 10 6:05 10 6:09 © 2010 RLM & Associates LLC 8 Illustration of Six Sigma Comparison of Pizza Delivery Times LSL = 5:45 PM USL = 6:15 PM 5:42 is a defect 6:20 is a defect Desired Delivery Time Company A missed the delivery time on days 2 and 6 4/13/2015 © 2010 RLM & Associates LLC 9 6 Sigma vs CQI How Does Six Sigma Differ from Continuous Quality Improvement An increased focus on quality as defined by your customers – the sigma level directly addresses this issue More rigorous statistical methods Prioritization of improvement projects and better alignment of organizational resources to support key strategic initiatives 4/13/2015 © 2010 RLM & Associates LLC 10 What is a Six Sigma Project? Problem to Address Is it a Six Sigma Project? DataOriented Problem Project Characteristics: 1.Impacts profitability or provides significant strategic value 2.Definitive project start and end dates 3.Targeted to reduce the problem by >70% over existing performance levels Results 4/13/2015 © 2010 RLM & Associates LLC DataDriven Solution Develop a Control Plan Realistic Solution 11 Six Sigma Summary Lean Six Sigma and its applications facilitate organizations to: 4/13/2015 1. Distinguish problematic areas of the business 2. Write quantifiable goals and objectives 3. Identify projects that create solutions to problems 4. Attain financial benefit from Six Sigma project improvements © 2010 RLM & Associates LLC 12 Benefits of Six Sigma Benefits of Six Sigma Greater process predictability Less waste and rework Products that perform better and last longer Customer who value you as a supplier 4/13/2015 © 2010 RLM & Associates LLC 13 External Communications Build Momentum Validate Investment Benefit Categorization Type I – Direct Benefits Type II – Redeployments and Cost Avoidance Certain Understand Financial Impact Type I Type II Less Certain Why Rigorously Classify Benefits? Clarity of the Cause-and-Effect Relationship=f(X) Rigorous Benefit Measurement Type III Type IV Direct Indirect Impact to Pre-Tax Income or Balance Sheet Type III – Direct Savings, but Lack of Certainty as to Cause Type IV – Other Benefits 4/13/2015 © 2009 RLM & Associates LLC 14 Define Phase 4/13/2015 © 2010 RLM & Associates LLC 15 DMAIC Method Define the project Define Maintain the gains – standardize Control Try it out – implement the solution 4/13/2015 Measure Improve Analyze © 2010 RLM & Associates LLC Measure the current situation Analyze to identify causes 16 DMAIC Method Develop the Charter Map the Process Determine VOC Collect Baseline Defect Data Plot Defect Data over Time Do Pareto Analysis Calculate Process Sigma 4/13/2015 Create Detailed Process Maps Write Problem Statement Identify Possible Solutions Develop Standard Practices Identify Potential Causes Select Solution Train Employees Develop & Pilot Plan Monitor Performance Implement Plan Summarize & Communicate Lessons Learned Group Potential Causes Collect Data Quantify Cause & Effect © 2010 RLM & Associates LLC Measure Results Evaluate Benefits Recommend Future Plans 17 Deliverables Lean Six Sigma DMAIC Roadmap Validated Project Charter Stakeholder Analysis Communication Plan Initial Project Plan Risk Mitigation Plan Updated Project in Tracking System Completed Tollgate Activities Define Review and Validate Project Charter VOC/VOB Problem Statement Goals Financial Benefits Project Timeline Launch Team Create Risk Mitigation Plan Create Communication Plan Create Initial Workplan Complete DEFINE Tollgate 4/13/2015 Value Stream Map Data Collection Plan Validated Measurement System Baseline Metrics Quick Wins Validated Financial Benefits Completed Tollgate Measure List of Potential Root Causes Validated Root Causes Prioritized List of Root Causes Quick Wins Completed Tollgate Analyze List of Potential Solutions Prioritized List of Solutions “To-Be” Value Stream Map Pilot Plan Pilot Results Detailed Implementation Plan Completed Tollgate Improve Complete Value Identify Potential Develop Potential Stream Map Root Causes Solutions Identify Key Input, Reduce List of Evaluate, Select & Process and Potential Root Optimize Best Output Metrics Causes Solutions Develop Data Validate Root Develop “To-Be” Collection Plan Causes Value Stream Map(s) Validate Prioritize Validated Develop and Measurement Root Causes Implement Pilot System Complete ANALYZE Solution Collect Baseline Tollgate Confirm Attainment Data of Project Goals Determine Process Develop Full-Scale Capability Implementation Conduct MEASURE Plan Tollgate Conduct IMPROVE © 2009 RLM & Associates LLC Tollgate Process Control System Implemented Solution Validation of Benefit Attainment Replication Plan Project Transitioned to Process Owner Completed Tollgate (Project Closed Out) Control Develop SOP’s & Training Plan Develop Process Control System Implement Solution Confirm Attainment of Project Goals Develop Replication Plan Transition Project to Process Owner Complete CONTROL Tollgate 18 DMAIC Method The DMAIC approach results in the following benefits: Provides a framework Provides a common language Provides a checklist top prevent skipping critical steps in the process Enables organizations to improve the way they improve 4/13/2015 © 2010 RLM & Associates LLC 19 Define Phase Overview Define – identify the issue causing decreased customer satisfaction. The following tools assist with the Define Phase. Management Commitment – Plan – Do – Study – Act SIPOC – Supplier - Input - Process - Output - Customer Define the problem – Affinity Analysis - the 5 whys and how Systems Thinking – process maps and value stream mapping Flowcharting Project Management Communications Plan 4/13/2015 © 2010 RLM & Associates LLC 20 Define Phase Overview 1. Which processes are key to the success of the organization and are in need of improvement? 2. What specific problems can be solved to improve the performance of this process and my organization? 3. What is the processes current performance baseline? 4. When does the organization expect to see improvement in the processes level of performance, what is my objective? 5. What financial benefit will the organization see if the projects objectives are met? 6. Which organizational goal(s) will this project impact? 4/13/2015 © 2010 RLM & Associates LLC 21 Steps for Defining a Project 1. Agree on what needs to be improved, this is defined as “Y” Factors (X’s) Process Process Responses (Y) 2. Identify the baseline performance of the “Y” 3. Create a process map 4/13/2015 © 2010 RLM & Associates LLC 22 Steps for Defining a Project 4. Identify the problem cost and impact. + 5. Write a Problem Statement Be sure the statement includes: What Where When Baseline Cost 6. Write an Objective Statement Be sure the statement includes: A METRIC BASELINE performance level The GOAL A TIME FRAME to achieve some BENEFIT The linkage to a specific CORPORATE GOAL or OBJECTIVE. 7. Obtain sponsor approvals and launch the project 4/13/2015 © 2010 RLM & Associates LLC 23 Writing a Problem Statement POOR Problem Statements: 1. Customers are complaining about their pizza delivery times. 2. There is a problem with the number of burnt pizzas. 4/13/2015 © 2010 RLM & Associates LLC 24 Writing a Problem Statement GOOD Problem Statements: 1. Since August 1, 2009, the average time to deliver pizza within a fifteen-mile radius is 39 minutes - a low of 24 minutes and a high of 49 minutes - this causes us to miss our delivery goal of less than 35 minutes 39% of the time. The result is customer complaints, delivery of cold pizzas and loss of business. This costs us $47,500 per year in scrapped/free pizzas, $9,750 in drivers’ expenses and an annual revenue loss of $300,000. 2. For the past 6 months, 8.5% of pizzas have been scrapped prior to boxing due to burnt crust. Also, 3.75% of pizzas delivered have been scrapped due to burnt areas in the cheese and toppings. Annually, this costs us $124,000 plus loss of customer satisfaction. These statements each include the following: WHAT is wrong, WHERE and WHEN is it occurring, what is the BASELINE magnitude at which it is occurring and what is it COSTING me? 4/13/2015 © 2010 RLM & Associates LLC 25 Writing an Objective Statement POOR Objective Statements: 1. Improve pizza delivery times. 2. Re-train employees to reduce the number of burnt pizzas. 4/13/2015 © 2010 RLM & Associates LLC 26 Writing an Objective Statement GOOD Objective Statements: 1. Reduce the number of pizzas delivered in over 35 minutes from 39% to less than 5% by August 1, 2010. This will support our Customer Satisfaction goal and achieve a hard savings of $85,000. 2. Reduce the number of burnt pizzas, including the cheese/ingredient area, from an average of 12.25% to less than 0.5% with an upper control limit of 1% by June 15, 2010. This will support our goal of operational excellence and provide a savings of $135,000. Each objective statement includes the following: Improve some METRIC from some BASELINE level to some GOAL, by some TIME FRAME, to achieve some BENEFIT and improve upon some CORPORATE GOAL or OBJECTIVE. 4/13/2015 © 2010 RLM & Associates LLC 27 Summary The likelihood of success for a Lean Six Sigma project is significantly enhanced as soon as it is accurately defined. 4/13/2015 © 2010 RLM & Associates LLC 28 Measure Phase 4/13/2015 © 2010 RLM & Associates LLC 29 Measure Phase Overview Measure – collect data from the process. Common tools used in the measure phase include: Management Commitment – Plan – Do – Study – Act Identify a Data Collection Plan Measurement System Analysis Collect Data – Check Sheets, Histograms, Pareto charts, Run Chart, Scatter Diagram, Flowcharts, Process Sigma Identify Variability – Instability, Variation, Off-target Benchmarking – Start by Establishing Baselines Start Calculating the Cost of Quality 4/13/2015 © 2010 RLM & Associates LLC 30 Measure Phase Overview 1. Is the actual process being performed what I think it is? (Process Map) 2. How do the processes linked with this problem truly work (Capability)? 3. Can I measure/detect accurately enough to make superior decisions (measurement system analysis)? 4. Which inputs (X’s) have the greatest effect on the outputs (Y’s)? Document the true process and agree on the most likely contributors (X’s) that impact the output(s) (Y) 4/13/2015 © 2010 RLM & Associates LLC 31 Process Mapping To correctly manage a process one must be able to communicate it so that it is easily understood. The most common approach for describing a process is to show the workflow with a Process Map and describe each operations purpose. The Measure Phase starts by describing the process under review. 4/13/2015 © 2010 RLM & Associates LLC 32 Process Mapping Processes mapping helps identify important and relevant project information such as: 1. 2. 3. 4. 5. 6. Process inputs Process outputs Supplier requirements Customer requirements Value-added and non-value added activities Data collection points a) Takt and Cycle times b) Defect and defective levels c) Inventory levels d) Cost of poor quality, etc. 7. Decision points 8. Process control needs 4/13/2015 © 2010 RLM & Associates LLC 33 Process Mapping There are usually three views of a process: 1 What you THINK it is.. 2 What it ACTUALLY is.. 3 What it SHOULD be.. 4/13/2015 © 2010 RLM & Associates LLC 34 Analyze Phase 4/13/2015 © 2010 RLM & Associates LLC 35 Analyze Analyze – study the process and data for clues to what is going on Management Commitment – Plan – Do – Study - Act Continual Improvement Preventative Maintenance Cleanliness Central Limit Theorem Production Floor Audits Hypothesis Testing, Design of Experiments 4/13/2015 © 2010 RLM & Associates LLC 36 Defects, Defectives and Opportunities What is a defect? Any type of undesired result is a defect. Invoice A failure to meet one of the acceptance criteria of your customers. A defective unit may have one or more defects. The non-conformance to intended usage requirement. What is a defective? The word defective describes an entire unit that fails to meet acceptance criteria, regardless of the number of defects within the unit. What is an opportunity? The number of characteristics, parameters or features that if any one is bad (a defect), would result in a defective unit. 4/13/2015 Supplier Data 1. Name 2. Tax Id # 3. Address 4. State 5. Zip Code 6. Qualified - Yes or No 7. Product Id 8. Required Payment Date Total Defects per Unit 1 x x Invoice # 2 3 4 5 x Hospital_________ Charge x x 3 1 1 0 0 DPU: 5 Defects / 5 Units = 1.0 Defects per Unit © 2010 RLM & Associates LLC 37 Opportunities – Patient Statements Opportunity - Any area within a product, process, service, or other system where a defect could be produced or where you fail to achieve the ideal product in the eyes of the customer. In a product, the areas where defects could be produced are the parts or connection of parts within the product. In a process, the areas are the value added process steps. If the process step is not value added, such as an inspection step, then it is not considered an opportunity. Opportunities are the things which must go right to satisfy the customer. It is not the number of things we can imagine that can go wrong . 4/13/2015 © 2010 RLM & Associates LLC 38 Internal vs. External Performance Internal Performance Sigma 2 3 4 5 6 Process Capability 4/13/2015 PPM 308,537 66,807 6,210 233 3.4 Defects per Million Opportunities © 2010 RLM & Associates LLC 39 Internal vs. External Performance Internal Performance Sigma 2 3 4 5 6 Process Capability 4/13/2015 External Performance (Customers) PPM Sigma 308,537 66,807 6,210 233 3.4 2 3 4 5 6 Defects per Million Opportunities © 2010 RLM & Associates LLC Process Capability PPM 308,537 66,807 6,210 233 3.4 Defects per Million Opportunities 40 Internal vs. External Performance Internal Performance Sigma 2 3 4 5 6 Process Capability External Performance (Customers) PPM Sigma 308,537 66,807 6,210 233 3.4 2 3 4 5 6 Defects per Million Opportunities Process Capability PPM 308,537 66,807 6,210 233 3.4 Defects per Million Opportunities Lower Internal Performance Represents Additional Screening, Reworking and Cost Incurred to Meet Customer Expectations 4/13/2015 © 2010 RLM & Associates LLC 41 Sigma Score Performance Observations Prescription Writing DPM IRS - Tax Advice Restaurant Bills 1,000,000 Baggage Handling 100,000 Payroll Processing 10,000 Patient Survives Surgery 1,000 100 10 Airline Safety Rate 1 0 1 2 3 4 Sigma Level 5 6 7 What is the difference between an IRS Tax Advice sigma of 2.5 and an Airline Safety sigma of 7? 4/13/2015 © 2010 RLM & Associates LLC 42 Analyze Phase Tools Analyze Phase Tools: Graphical Analysis – Pareto Charts, Bar Charts, Histograms etc. Cause & Effect Diagrams Box Plots Probability Distributions Time Series Charts Control Charts, Run Charts Correlation or Scatter Plot 4/13/2015 © 2010 RLM & Associates LLC 43 Improve Phase 4/13/2015 © 2010 RLM & Associates LLC 44 Improve Improve – act on the data to change the process for improvement Management Commitment – Plan – Do – Study – Act Process Improvement Initiatives Organizational Development - Training Variation Reduction Problem Solving Brainstorming Alternatives – Affinity Analysis Create “should be” or “future state” maps or flowcharts Conduct FMEA 4/13/2015 © 2010 RLM & Associates LLC 45 Trial and Error Experiments The usual approach: For the most part X’s are not controlled. Some X’s may not be known. When conducting a trial and error approach the value of the X’s are often selected based on experience. Responses or outputs are monitored. If preferred outcomes are not attained (error) a further set of inputs are selected (Trial). If the results meet expectations, the experiment is considered a success…or is it? 4/13/2015 © 2010 RLM & Associates LLC Brainstorming No Ideas Trials Problem Solved? Yes?? 46 (OFAT) Approach INPUTS Select only one at a time Fix A Vary Fix B Fix D C OUTPUTS Monitor 1 or More Y=f(X) Y1 Process, Product or Service Y2 Y3 Responses Noise Inputs OUTPUTS Y1 * * Y1 ** ** * * * ** * * * * * * * * * * Y3 * INPUT B 4/13/2015 © 2010 RLM & Associates LLC 47 Design of Experiments Controllable Factors X’s Vary A Vary Vary B Vary D Y’s Responses Y1 Process Y2 C The variables manipulated during the experiment to observe their effects on the response variables LEVELS The values, quantitative or qualitative of each factor during the experiment 4/13/2015 Y=f(X) Y3 Noise Factors The variables that are the outcome of the experiment The uncontrolled variables not selected or are not known which can affect the response variable during the experiment © 2010 RLM & Associates LLC 48 Experimental Roadmap Narrowing of possible factors, generally more than 7, to a critical few Screening Experiments Quantify the functional relationship between approximately 4 to 7 factors (X’s) and outputs response variables (Y’s) Characterization Experiments Optimization Experiments Find the optimal process settings with only 2 to 4 factors. With an iterative approach one can manage the complexity of any single experiment. 4/13/2015 © 2010 RLM & Associates LLC 49 Design Of Experiments Level Factor A Factor B High Low High Low Process, Product or Service Y In general, the number of experimental runs will be 2k, where k is the number of variables being studied. – Example: An experiment studying 4 variables will have 24 = 16 runs. 4/13/2015 © 2010 RLM & Associates LLC Run X1 X2 Y 1 Low Low .578 2 Low High .600 3 High Low .559 4 High High .589 A B C D - - - - - - - + - - + - - - + + - + - - - + - + - + + 50 Design of Experiments Experimental Results Bond Strength – Pounds 23 USL 22 21 Vendor A Vendor B 20 19 LSL 18 17 600F 595F 590F 585F 580F 16 At this level of process analysis one no longer needs to inspect process outputs. Instead, simply control the input settings and let the process take care of itself. 4/13/2015 © 2010 RLM & Associates LLC 51 DOE Terminology Factor Any variable whose effect on an output is being studied. Synonyms include variable, treatment, X, input. Levels The specific settings used during the experiment for each of the factors. Noise The disturbance effect of those variables not purposefully included as factors. Response The variable whose output is the object of the study. Synonyms include output and Y. Condition A specific set of input variable settings. Replication Repetition of an experimental condition to assess the level of noise in the system. Randomization Running experimental conditions in a random order to mitigate the effect of noise variables. 4/13/2015 © 2010 RLM & Associates LLC 52 DOE Terminology Main Effects The impact of a single factor, by itself, on the output. Interaction Effects The impact of a simultaneous combination of factors on the output. Runs Each time an experimental condition is processed through the system being studied. Design The work done before the experiment is conducted to configure the test settings and conditions so the maximum amount of information is obtained from the minimum number of experimental runs. Analysis The work done after the experiment is conducted to refine data into useful information. Factorial Experiment An experiment that has 2k orthogonal experimental conditions. 4/13/2015 © 2010 RLM & Associates LLC 53 Primary Sources of Variation Inadequate Design Margin + Unstable Material & Equipment + Insufficient Process Management + Inconsistent Organizational Approaches The individual variances add together to form the total variation 4/13/2015 © 2010 RLM & Associates LLC 54 Control Phase 4/13/2015 © 2010 RLM & Associates LLC 55 Control Control – monitor the system to sustain the gains Management Commitment – Plan - Do – Study – Act Develop control plans Develop long-term Measurement System Analysis Mistake – proofing Process behavior charts Updated lessons learned 4/13/2015 © 2010 RLM & Associates LLC 56 Interpreting Control Charts One or more observations occurring more than 3 standard deviations from the average, i.e. any points occurring above or below the control limits. 4/13/2015 © 2010 RLM & Associates LLC UCL +2 +1 Average -1 -2 LCL 57 Interpreting Control Charts Fifteen consecutive observations occurring within one standard deviation from the average. 4/13/2015 © 2010 RLM & Associates LLC UCL +2 +1 Average -1 -2 LCL 58 Interpreting Control Charts Two out of three consecutive observations, all on the same side of the average and occurring more than two standard deviations away form the average. 4/13/2015 © 2010 RLM & Associates LLC UCL +2 +1 Average -1 -2 LCL 59 Interpreting Control Charts Eight consecutive observations that are more than one standard deviation from the average. 4/13/2015 © 2010 RLM & Associates LLC UCL +2 +1 Average -1 -2 LCL 60 Interpreting Control Charts Four out of five consecutive observations, all on one side of the centerline occurring more than one standard deviation from the average. 4/13/2015 © 2010 RLM & Associates LLC UCL +2 +1 Average -1 -2 LCL 61 Interpreting Control Charts Fourteen consecutive observations that alternate up and down. 4/13/2015 © 2010 RLM & Associates LLC UCL +2 +1 Average -1 -2 LCL 62 Interpreting Control Charts Eight consecutive observations on one side of the average. 4/13/2015 © 2010 RLM & Associates LLC UCL +2 +1 Average -1 -2 LCL 63 Interpreting Control Charts Six consecutive observations that trend downward or upward. 4/13/2015 © 2010 RLM & Associates LLC UCL +2 +1 Average -1 -2 LCL 64 The Control Chart How to Constructing Control Charts 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 4/13/2015 Select critical “X’s” to be charted. Identify purpose of the chart. Determine data-collection points. Create the basis for sub-grouping the Y’s. Choose the type of Control Chart. Agree on the measurement method/criteria. Select the sampling interval/frequency. Agree on the sample size. Determine the basis of calculating the Control Limits. Prepare written instructions for all phases. Conduct the necessary training. © 2010 RLM & Associates LLC 65 I-MR Chart Individuals Chart Observation Measure 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 4 3 2 1 0 -1 -2 -3 -4 Data LCL Xbar UCL M Rbar Chart Observation 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 5 4 Range We chart it! 1 Range 3 LCL 2 Rbar UCL 1 0 Xbar Chart Subgroup 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1.5 1 Xbar Xbar 0.5 0 LCL -0.5 Xbarbar -1 UCL -1.5 -2 4/13/2015 © 2010 RLM & Associates LLC 66 4/13/2015 Rbar Chart Subgroup 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 6 Rbar 5 Rbar 4 LCL 3 Rbar 2 UCL 1 0 U Chart Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 DPU 0.8 DPU 0.6 LCL 0.4 Ubar UCL 0.2 0 P Chart Sam ple 1 Proportion Defective (P) And we chart it some more! Xbar-R Chart 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 P LCL Pbar UCL © 2010 RLM & Associates LLC 67 Summary Choose Appropriate Control Chart type of data ATTRIBUTE type of attribute data DEFECTS CONTINUOUS subgroup size DEFECTIVES Sample size 1 type of defect type of subgroups CONSTANT VARIABLE CONSTANT VARIABLE C Chart U Chart NP Chart P Chart Number of Incidences Incidences per Unit Number of Defectives Proportion Defectives 4/13/2015 © 2010 RLM & Associates LLC 2-5 10+ I – MR Chart X–R Chart X–S Chart Individuals & Moving Range Mean & Range Mean & Std. Dev. SPECIAL CASES Cusum Chart EWMA Chart Cumulative Sum Exponentially Weighted Moving Average 68 Managing the Process Performance “Inbound” inputs (X’s) Information People Energy Tools Equipment Activity Actions Blending of inputs Methods Procedures Materials Environmental effects “Inside” inputs (X’s) Control the Critical X’s with appropriate control methods (processcontrol plans) P1 P2 P4 4/13/2015 Step P3 P5 P1 P2 P3 Q1 P4 “Outbound” outputs (Y’s) Process Information People Energy Tools and Equipment Activity Actions Blending of Inputs Methods Procedures Materials Environmental Effects Manage CTQ’s with the process-management system summary chart Process A Process Flow Sub processes combined to create an output to the next “customer” “Inside” outputs (Y’s) Process P1 Indicator Proce ss Ow ner Ste p Perfor mance Target Sortin g Jon es P1 4.2% 1.3% © 2010 RLM & Associates LLC Tren d Links To: Custo mer Improve ment Activities Merge I4 Smith None Comme nts 69 Measuring Process Management Maturity Level 1 Where we are starting Level 2 Disciplined Process Level 3 Standard, Consistent Process Processes not documented Indicators not in place Process performance not consistent Success depends on individual efforts Process flowcharts in place Indicators are identified Indicators are linked to “next-process customer” Regular, reliable data reporting Improvement opportunities identified Processes are standardized and integrated Supervisors use Process Management Systems Improvement projects are prioritized based on data Level 4 Predictable Process Upstream prevention in place Using Statistical Process Control Process performance is: Statistically stable and capable of meeting customer requirements Level 5 Optimized Process Continuous improvement: Reduces variability of process, Increases process flexibility Innovation and “break-through” Exceeding product and service quality goals 4/13/2015 © 2010 RLM & Associates LLC 70