IASSC Black Belt UPDATED TEST Questions And
CORRECT Answers
Carl Fredrich Gauss contribution - CORRECT ANSWERS Introduced the concept of the
normal curve
Walter Shewart contribution - CORRECT ANSWERS 3 sigma from the mean is the point
where process requires correction
implemented control charts and SPC
Bill Smith Contribution - CORRECT ANSWERS motorola engineer who coined the term six
sigma- began measuring DPMO
Bob Galvin Contribution - CORRECT ANSWERS Chairman of motorola when they began
implementing six sigma methodology- documented 16 billion in savings
Larry Bossidy Contribution - CORRECT ANSWERS Implemented six sigma at allied signal
(now honeywell)
Jack Welch Contribution - CORRECT ANSWERS Implemented six sigma ay General Electric
Geoff Tennant Contribution - CORRECT ANSWERS Wrote book Six Sigma: SPC and TQM
T or F: A Successful Six sigma from should produce a decreased need for management efforts to
maintain quality. - CORRECT ANSWERS False
,5 Why method - CORRECT ANSWERS Brainstorming method to search for special cause
variation that cause products to be out of control. method entails asking why 5 times to drill
down to its root cause.
Overcorrection in control charts can occur when - CORRECT ANSWERS Can occur when
attempting to correct processes for common cause variation. By attempting to control common
cause you can implement a special cause that makes the product become out of control.
Stable processes contain what kind of variation - CORRECT ANSWERS Contain common
cause variation and no special cuase variation and remain inside the UCL and LCL. UCL and LCL
are often 3 sigma above/ below the centerline.
T or F: capability analysis can be performed on unstable processes. - CORRECT
ANSWERS False- Capability analysis must be performed on stable processess
Control limits vs specification limits - CORRECT ANSWERS Control limits are based on
process variation. Specification limits are based on customer requirements. A process can be in
control and yet not be capable of meeting specifications.
Centerline of control chart - CORRECT ANSWERS The center line of your control chart
represents your actual process average, not necessarily your desired process average. Do not
confuse the center line with the target value for your process. The target is your desired
outcome, not the actual outcome.
8 Control Chart tests - CORRECT ANSWERS Give indications that there are special causes
of variation present (tests for special causes) *some of these assume normality
1
Beyond Limits
One or more points beyond the control limits
,2
Zone A
2 out of 3 consecutive points in Zone A or beyond
3
Zone B
4 out of 5 consecutive points in Zone B or beyond
4
Zone C
7 or more consecutive points on one side of the average (in Zone C or beyond)
5
Trend
7 consecutive points trending up or trending down
6
Mixture
8 consecutive points with no points in Zone C
7
Stratification
15 consecutive points in Zone C
8
Over-control
, 14 consecutive points alternating up and down
Method to investigate special cause variation - CORRECT ANSWERS Brainstroming
-Fishbone Diagram (cause and effect)
-5 why method
4 process states depicted in control charts - CORRECT ANSWERS Ideal - In control and
100% conformance
Threshold - In control and occasional nonconformance
Brink of chaos - Out of control and mostly in conformance (unpredictable, false sense of
security)
Chaos - out of control and not in conformance
What is a subgroup in a control chart? - CORRECT ANSWERS A subgroup is a group of
units that are created under the same set of conditions. Subgroups (or rational subgroups)
represent a "snapshot" of the process. Therefore, the measurements within a subgroup must be
taken close together in time but still be independent of each other.
observations x subgroups = total observations
When is it not appropriate to measure subgroups? - CORRECT ANSWERS Each sample is
uniquely identified with a specific period of time.
Each sample represents one distinct batch.
There are long time intervals between each sample.
Sampling or testing is destructive and/or expensive.
CORRECT Answers
Carl Fredrich Gauss contribution - CORRECT ANSWERS Introduced the concept of the
normal curve
Walter Shewart contribution - CORRECT ANSWERS 3 sigma from the mean is the point
where process requires correction
implemented control charts and SPC
Bill Smith Contribution - CORRECT ANSWERS motorola engineer who coined the term six
sigma- began measuring DPMO
Bob Galvin Contribution - CORRECT ANSWERS Chairman of motorola when they began
implementing six sigma methodology- documented 16 billion in savings
Larry Bossidy Contribution - CORRECT ANSWERS Implemented six sigma at allied signal
(now honeywell)
Jack Welch Contribution - CORRECT ANSWERS Implemented six sigma ay General Electric
Geoff Tennant Contribution - CORRECT ANSWERS Wrote book Six Sigma: SPC and TQM
T or F: A Successful Six sigma from should produce a decreased need for management efforts to
maintain quality. - CORRECT ANSWERS False
,5 Why method - CORRECT ANSWERS Brainstorming method to search for special cause
variation that cause products to be out of control. method entails asking why 5 times to drill
down to its root cause.
Overcorrection in control charts can occur when - CORRECT ANSWERS Can occur when
attempting to correct processes for common cause variation. By attempting to control common
cause you can implement a special cause that makes the product become out of control.
Stable processes contain what kind of variation - CORRECT ANSWERS Contain common
cause variation and no special cuase variation and remain inside the UCL and LCL. UCL and LCL
are often 3 sigma above/ below the centerline.
T or F: capability analysis can be performed on unstable processes. - CORRECT
ANSWERS False- Capability analysis must be performed on stable processess
Control limits vs specification limits - CORRECT ANSWERS Control limits are based on
process variation. Specification limits are based on customer requirements. A process can be in
control and yet not be capable of meeting specifications.
Centerline of control chart - CORRECT ANSWERS The center line of your control chart
represents your actual process average, not necessarily your desired process average. Do not
confuse the center line with the target value for your process. The target is your desired
outcome, not the actual outcome.
8 Control Chart tests - CORRECT ANSWERS Give indications that there are special causes
of variation present (tests for special causes) *some of these assume normality
1
Beyond Limits
One or more points beyond the control limits
,2
Zone A
2 out of 3 consecutive points in Zone A or beyond
3
Zone B
4 out of 5 consecutive points in Zone B or beyond
4
Zone C
7 or more consecutive points on one side of the average (in Zone C or beyond)
5
Trend
7 consecutive points trending up or trending down
6
Mixture
8 consecutive points with no points in Zone C
7
Stratification
15 consecutive points in Zone C
8
Over-control
, 14 consecutive points alternating up and down
Method to investigate special cause variation - CORRECT ANSWERS Brainstroming
-Fishbone Diagram (cause and effect)
-5 why method
4 process states depicted in control charts - CORRECT ANSWERS Ideal - In control and
100% conformance
Threshold - In control and occasional nonconformance
Brink of chaos - Out of control and mostly in conformance (unpredictable, false sense of
security)
Chaos - out of control and not in conformance
What is a subgroup in a control chart? - CORRECT ANSWERS A subgroup is a group of
units that are created under the same set of conditions. Subgroups (or rational subgroups)
represent a "snapshot" of the process. Therefore, the measurements within a subgroup must be
taken close together in time but still be independent of each other.
observations x subgroups = total observations
When is it not appropriate to measure subgroups? - CORRECT ANSWERS Each sample is
uniquely identified with a specific period of time.
Each sample represents one distinct batch.
There are long time intervals between each sample.
Sampling or testing is destructive and/or expensive.
