Six Sigma – Glossary & Terminology
Given below is a glossary of terms commonly used in the domain of Six Sigma:
Original Team (Original DMAIC/Quick Hit Project Team)
It is the team that originated and completed the original process improvement project (DMAIC or Quick Hit) in their property. The role of the Original Team is to ensure proper project documentation to ease transfer and to provide advice, clarification and assistance to teams importing their project.
Optional Best Practices
A completed project usually, but not always a Six Sigma DMAIC or Quick Hit project, that is particularly valuable for use in other properties.
Output
Any product, service, or piece of information coming out of, or resulting from, the activities in a process.
Output Measures
These are the measures related to and describing the output of the process; total figures/overall measures.
Pareto Principle and Chart
A Pareto Chart is a data display tool based on Pareto Principle; or 80/20 rule. It is used to help a team focus on the specific causes or issues that have the greatest impact if solved.
Pilot
It is the trial implementation of a solution on a limited scale to ensure its effectiveness and test its impact.
Plan-Do-Check-Act (or PDCA)
It is basic model or set of steps in continuous improvement; also referred to “Shewhart Cycle” or “Deming Cycle”.
Poka-Yoke
Poka-Yoke is a Japanese term for “mistake proofing. Mistake proofing typically looks at every step in the process in detail, and uses creative thinking to develop ways to keep errors from occurring.
Precision
It is the accuracy of a measurement. When used in reference to sampling, this entails how much of change you need to be able to detect. As the need for precision increases, so does the sample size.
Preliminary Plan
It is used in the early phase of a project, while developing milestones for team activities related to process improvement; includes key tasks, target completion dates, responsibilities, potential problems, obstacles and contingencies, and communication strategies.
Process
It is a series of steps or actions that lead to a desired result or output. A set of common tasks that creates a product, service, process or plan that will satisfy a customer or group of customers.
Process Owner
Process owners are the responsible individuals for a specific process.
Process Capability
Statistical measures that summarize how much variation there is in a process relative to customer specifications.
Process Improvement
Improvement approach focused on incremental changes, involves solutions to eliminate or reduce defects, costs, or cycle time; leaves basic design and assumptions of a process intact.
Process in Control
A statistical concept indicating that a process is operating within an expected range of variation and that variation is being influenced mainly by “common cause” factors; processes operating in this state are referred to as “in control”.
Process Management
It involves defining and documenting a process, monitoring it on an ongoing basis to ensure that measures are providing feedback on the flow/function of a process; key measures include financial, process, people, and innovation.
Process Map or Flowchart
Graphic display of the flow or sequence of events that a product or service follows; it shows all activities, decision points, rework loops, and handoffs.
Process Measures
It is a measure related to individual steps in the process and/or the overall process; can be predictors of output measures.
Process Redesign
It is a method of restructuring a process by eliminating handoffs, rework, inspection points, and other non-value-adding activities; typically means a “clean slate” design and accommodates major changes or improvements.
Project Definition Form (PDF)
It is the summary of pertinent information that describes a SIXSIGMA project. This includes problem statement, goal statement, scope, business case, financial benefits and costs, project timing, resource requirements, measures, etc
Project Management
It is the use of tools, techniques, and/or software to track a project and prevent barriers to on-time success.
Project Nomination (iDMAIC)
A Black Belt, MBB, Sponsor, or General Manager associated with a project nominates the project for Innovation Transfer, using the e-Six Sigma project tool. The nominator evaluates the project.
Project Selection (iDMAIC)
During quarterly review meetings, each Division Council reviews all projects that have been nominated as best practices.
Project Sponsor
This is a member of the executive committee, strong advocate of the project and can assist with barriers that may come up.
Project Rationale
It is a broad statement defining area of concern or opportunity, including impact/benefit of potential improvements, or risk of not improving a process; links to business strategies, the customer, and/or company values.
Property SIXSIGMA Council
It is the governing group responsible for project selection and status monitoring at each Starwood property. The members of the SSC are the General Manager, the Executive Committee and the Black Belt.
Proportion Defective
Percentage (or fraction such as 1/8) of defective units; number of defective units divided by the total number of units.
Propose
It is the very first phase in the lifecycle of a SIXSIGMA project (DMAIC or Quick Hit). in which the potential project idea or opportunity is proposed to the property SIXSIGMA Council.
Quick Hit Project
It is a small project that can be quickly implemented and that does not require a Black Belt to resolve and implement.
RACI Matrix
A project management tools that identifies all required tasks or activities, the parties are involved in those tasks as well as their level or type of involvement.
A RACI is used to ensure clarity on roles and responsibilities in a team environment.
Return on Investment (ROI)
It is a measure of the financial returns from an investment opportunity, expressed as a percentage. All else being equal, projects with a larger ROI are more attractive investment opportunities.
Random Sampling
It is a method that allows each item or person chosen to be measured, to be selected completely by chance.
Systematic sampling
Sampling method in which elements are selected from the population at a uniform level Systematic or subgroup sampling ensures the sample represents the process because each time period is represented.Team Leader
For DMAIC projects, the team leader is usually the Black Belt. For Quick Hit and iDMAIC projects, it is typically the Sponsor or Process Owner. For large DMAIC projects with more than one BB or MBB, the Team leader is the main point of contact for the project.
Regression
It is the statistical study of relationships. An analytical tool that allows an assessment of a key outcome and extent to which one or more factors being studied can explain the variation in results see also Simple Linear.
Repeatability/Reproducibility
Repeatability means that the same person taking a measurement on the same unit gets the same result. Reproducibility means that the other people, other instruments or other labs get the same result you get when measuring the same item or characteristic.
Required Best Practices
A project designated by the division or global leadership team that delivers superior performance when implemented across a class of properties. “Required” means that all properties in a “class” must implement the best practice by a specified point in time.
Response Plans
The plans that are developed during the “Control” phase for DMAIC and iDMAIC projects to ensure that the gains achieved can be maintained.
Reverse SIXSIGMA
This is a method which can be used by MBBs (and BBs) in times of financial contingency to help guide restructuring discussions
Revision Plan
A mechanism for updating processes, procedures, and documentation.
Rework Loop
It is an instance in a process when the item or data moving through the process needs correction by returning it to a previous step in the process.
Risk Management
Risk management is thinking ahead, identifying potential problems, and preparing for things that may go wrong.
Rolled Throughput Yield
The cumulative calculation of defects through multiple steps in a process; calculated as the product of the individual yield at each step.
Run Chart (or time plot, trend chart)
Measurement display tool showing variation in a factor over time; indicates trends, patterns, and instances of special causes of variation.
SIPOC
A SIPOC is a high-level process map that includes Suppliers, Inputs, Process, Outputs, and Customers, and defines the start and end points of a process.
SIXSIGMA
It is a term used to describe process improvement initiatives using sigma-based process measures and/or striving for SIXSIGMA-level performance.
SIXSIGMA Council Training
A course designed to enable property Executive Committees and senior leaders to make value-driven decisions by identifying, prioritizing, and sizing projects for their Black Belts.
SIXSIGMA Councils
It is a leadership group that guides the implementation of quality or SIXSIGMA within an organization; establishes, reviews, and supports the progress of quality improvement teams.
Statistical Process Control (SPC)
It is use of data gathering and analysis to monitor processes, identify performance issues, and determine variability/capability.
Sampling
Collecting and using a portion of all of the data to draw conclusions (for example, timing the check-in process for every tenth guest).
Sampling Bias
It is collecting an unrepresentative “slice” of data that leads to inaccurate conclusions.
Scatter Plot or Diagram
It is the graph used to show the relationship or correlation between two factors or variables.
Scope
It defines the boundaries of the process; clarifies specifically where the start and end points for improvement reside, defines where and what to measure and analyze and needs to be within the sphere of control of the team, working on the project.
Simple Linear Regression
The statistical study of the relationship between a single variable X to a single output Y.
Solution Statement
A clear description of the proposed solution used to evaluate and select the best solution to implement.
Special Cause Variation
It is an event that impacts processes only under “special” circumstances i.e., not part of the usual, daily operation of the process.
Stakeholder Analysis
Identifies all stakeholders impacted by a project and their anticipated and required levels of support for the project. Typical stakeholders include managers, people who work in the process under study, other departments, customers, suppliers and finance.
Standard Deviation
Standard Deviation is an indicator of the amount of variation or inconsistency in any group of items or processes.
Standard Operating Procedure (SOP)
A document that compiles all procedures, job tasks, scripts of interactions with customers or others, data collection instructions and forms, and an updated list of resources to be consulted for clarification of procedures.
Storyboard
It is a visual display outlining the highlights of a project and its components leading the team to a solution.
Stratification
Stratification means dividing data into groups based on key characteristics. The purpose of dividing data into groups is to detect a pattern that localizes a problem and explains why the frequency of impact varies between times, locations or conditions.
Sub-process
It is a sub-component of a larger process.
Supplier
It is a person or an organization that feeds inputs (products, services, or information) into the process.
Team Member
It is an active member of a Six Sigma Project team, heavily involved in the measurement, analysis, and improvement of a process.
Tollgate
It is a review session that determines whether activities up to that point in a project have been satisfactorily completed. Tollgates are commonly conducted to review critical decisions during a project.
Transfer Team
Team formed at a property, with responsibility for importing a Best Practice (Optional or required), led by a Team leader appointed by the property Six Sigma Council, and coached by the Black Belt at the property when needed. Transfer teams will use the iDMAIC methodology to import innovation into their properties.
Transfer Team Leader (Process Owner/Department Head)
A person selected by the GM and property SIXSIGMA Council to lead an iDMAIC project based primarily on proximity and decision-making authority relative to the process involved. This person has primary responsibility for implementing the project, leading the team, and interacting with others to gather information and understanding necessary to succeed. Often, the transfer team leader will be the department head or process owner of the process being improved with the best practice. The ability to lead the team and to anticipate clear barriers are important characteristics for a person in this role.
Transfer Team Member
Associates selected by the Transfer Team Leader and Six Sigma Council to serve on the iDMAIC project based on their knowledge of key aspects of the process, experience with the current process, enthusiasm for improvement, and ability to champion change.
Transfer Project
It is a project that a property imports from another property.
Tree Diagram
It is a branching diagram used to break any broad goal into increasingly detailed levels of actions.
Value Adding Activities
These are the activities introduced to improve the current process closer to the ideal process.
Value-enabling Activities
Steps/tasks in a process allowing work to move forward; can also be viewed as necessary steps that are not themselves adding value but that contribute to the delivery of the product or service. Examples include selecting new employees, purchasing supplies, and balancing the books.
Variation
These are the changes or fluctuations that determine how stable or predictable a process may be or affected by environment, people, equipment, methods, measurements, and materials.
Voice of the Customer (VOC)
It is a systematic approach to gather and analyze customer requirements, expectations, level of satisfaction and dissatisfaction through complaints, surveys, comments, market research, focus groups and interviews.
WACC
Weighted Average Cost of Capital used to compare the value of 2 or more potential projects. Discount rate used in financial analysis. Represents the average cost for a company to finance itself from equity and debt. In 2002, this rate was 12%, and was used for all SIXSIGMA projects and locations.
Six Sigma Summary
We can summarize the following points:
* Six Sigma is a philosophy of quality improvement.
* Six Sigma is 3.4 defects in one million opportunities (DPMO).
* Components of Six Sigma are Customer, Process, and Employees.
Six Sigma implementation requires the following roles:
* Business Leader
* Sponsor
* Black Belt
* Master Black Belt
* Green Belt
The generic cycle of Six Sigma includes the following phases: Define, Measure, Analyze, Improve, and Control.
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