Page 131 - Six Sigma Demystified

112 Six SigMa DemystifieD

CHaPTER 5 QUiz

1. In developing a process flow diagram of the current process, the team should
involve
a. representatives from each of the process stakeholder groups.
B. only the engineers responsible for designing the process because they know
how it’s supposed to be done.
C. only the process personnel because they know how it is actually done.
D. only the project sponsor because he or she is paying the bill for the project
team’s work.

2. If the baseline estimates in the measure stage do not match the performance
levels used to justify the project in the define stage, then
a. verify that the process personnel conducted the baseline study using the same
procedures employed in daily practices.
B. verify the performance levels used to justify the project in the define stage.
C. the differences should be investigated in the analyze stage to determine
potential process factors that would replicate the define- stage behavior.
D. all the above should be evaluated.

3. If 1,000 units start a process and 100 units are scrapped owing to a total of
300 defects, the throughput yield of the process is calculated as
a. 90 percent.
B. 70 percent.
C. 97 percent.
D. 81 percent.

4. If 1,000 units start a process and 100 units are effectively reworked owing to
a total of 300 defects, the throughput yield of the process is calculated as
a. 90 percent.
B. 70 percent.
C. 97 percent.
D. 81 percent.

5. A simple process yield estimate, calculated by dividing the number of units
completing the process by the number of units starting the process,
a. is a simple and effective metric for evaluating the true performance of a
process.
B. provides a good indication of the impact of the “hidden factory.”
C. fails to reflect reworks or other corrections internal to the process.
D. all the above are true.

6. If the rolled throughput yield for a three- step process is 92 percent, then an
acceptable target throughput yield for each step of the process is
a. 92 percent.
B. 81 percent.