Six Sigma Glossary

This Six Sigma Glossary provides an overview of commonly used Six Sigma terms and tools.

CAPABILITY INDICES            

  • A mathematical calculation used to compare the process variation to a specification.  Examples are Cp, Cpk.  Used to compare processes across businesses

CHAMPION                           

  • An upper level business leader who identifies, selects and charters continuous improvement projects and supports the delivery thereof

CONTROL PLAN                    

  • A process control document that lists all of the elements required to control variations in a process under study or in routine operation

CONTROL SPECIFICATIONS   

  • Customer requirements for a process under study or in routine operation

COST OF POOR QUALITY (COPQ)  

  • Cost associated with providing poor quality products or services.  The cost of not producing first quality for the Customer the first time and every time

CUSTOMER                            

  • People process or equipment that receives products or services from you as supplier. These may be internal of external customers

DEFECT                                  

  • Any characteristic that deviates outside of customer requirements

DEFECT PER MILLION (DPM)   

  • A quality metric often used in the Lean Six Sigma process. It is calculated by the number of defects observed divided by the number of opportunities for defects compared to 1 million units



Six Sigma Glossary continues ...

DESIGN OF EXPERIMENT (DOE)          

  • A formal, proactive method for experimenting with Xs and Ys. It involves concepts such as factors, levels, center points, blocking, and replications

GAGE ACCURACY                 

  • The average difference observed between a gage under evaluation and a master gage when measuring the same parts over multiple readings

GAGE REPEATABILITY          

  • A measure of the variation observed when a single operator uses a gage to measure a group of randomly ordered (but identifiable) parts on a repetitive basis

GAGE REPRODUCIBILITY      

  • A measure of average variation observed between operations when multiple operators use the same gage to measure a group of randomly ordered (but identifiable) parts on a repetitive basis

GREEN BELT (GB)                 

  • Lean Six Sigma role similar in function to Black Belt but length of training and project scope are reduced

HISTOGRAM                          

  • Vertical display of a population distribution in terms of frequencies

PROCESS INPUT VARIABLE 

  • The vital few input variables, called “X’s”



Six Sigma Glossary continues ...

PROCESS OUTPUT VARIABLE

  • The output variable, called “Y”.  Usually only one Y is studied at a time

MASTER BLACK BELT (MBB)

  • A person who is an “expert” on Lean Six Sigma techniques and on project implementation.  Master Black Belts play a key  role in training and coaching of Black and Green Belts

MEASUREMENT SYSTEMS (MS)

  • Means of evaluating a continuous or discrete measurement system with the intention of discovering how “good” or “bad” the measurement systems are

MINITAB                                

  • Statistical software package that operates in a Windows environment and is the main statistical package used by students

MULTI-VARI ANALYSIS        

  • (Inferential Statistics) Passive data collection method used in  to display in the variation within parts,  machines, or processes between machines or process parts, and over time

NORMAL DISTRIBUTION      

  • A continuous, symmetrical density function characterized by a bell-shaped curve



Six Sigma Glossary continues ...

PROBABILITY                        

  • The chance of an event happening or condition occurring by pure chance

PROCESS                                

  • The method in which something is manufactured or serviced

PROCESS MAP                      

  • A step-by-step pictorial sequence of a process showing process inputs, process outputs, cycle time, decision points, rework operations and inspection points

PROCESS OWNER                 

  • is the individual who accompanies the project work and assist with implementation of the solution. This individual owns the process and ensures improvements implemented are sustained and continuously improved

PROCESS SPREAD                 

  • The range of values which a given process characteristic displays; this term most often  applies to the range but may also include  the variance.  The spread may be based on a set of data collected at a specific point in time or may reflect the variability across a given period of time


Home Reference > Six Sigma