Six Sigma Control Tools and Documentation
What are the characteristics of a control plan?
-A control plan includes information on frequency and method of measurement, as well as miscellaneous information, such as notes and meeting minutes -A control plan is an accessible, single document summary -Checking, monitoring, and response activities are included in the control plan -A control plan may address a product or one or more related processes
What categories of information should you include in a control plan?
-Graphical elements -Administrative information -Control indicators -Responsibilities -Methods and procedures -Lessons learned
What are some of the characteristics of effective documentation?
-Includes contingency instructions -Is simple, brief, and clear -Is accessible -Is current
What factors can help you determine the correct type of control chart to use for a specific data set?
-Size of subgroup -Type of distribution -The type of data
What actions are part of the process for transferring responsibility for the control plan from the Six Sigma team to the process owner?
-Updating all work instructions to ensure consistent actions are taken in response to out-of-control variation -Ensuring that the control plan integrates well into operational activities -Setting up a clear and logical documentation process for control -Securing buy-in and understanding from the operational employees involved in monitoring the process
How can you tell when a process is out of control?
-You're not getting a repeatable output in terms of your mean and standard deviation -On a control chart, some points are outside the control limits
1.Represents the numerical average or central tendency of the quality characteristic being plotted 2.Identifies the range of variation that can be ascribed to common causes 3.Represents the status of a process characteristic at a point in time 4.Incorporates a time sequence and the characteristic being measured
1.Center line 2.Control limit 3.Data point 4.Axis
Rank the quality system documents according to their place in the Six Sigma documentation hierarchy.
1.Document that contains an overall view of processes in the quality system 2.Document that contains roles and responsibilities for doing the work 3.Step-by-step instructions for exactly how to do each task 4.Documentation that is kept as evidence of regulatory compliance
1.A run of 12 data points in a row, all above the mean 2.A run of 20 data points in a row, all clustered around the center line 3.A run of 16 data points in a row that are alternating up and down 4.Data points that show values close to the UCL at the same time each day
1.Process shift 2.Stratification 3.Systematic variation 4.Recurring cycles
1.You have variables data and a sample size of six 2.You have classified defects into equal-sized subgroups 3.You have continuous data and just one subgroup 4.You have counted 85 defects and they are in equal-sized subgroups
1.Xbar-R 2.NP 3.I-mR 4.C
How would the use of Xbar-R charts support process control efforts?
They show you when a process has stopped performing within the specified range
