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First Edition Dated September, 2000 8
Process
Variation
4.2.1a
4.2.1 4.2.2 4.2.3 4.2.4
4.2.6
4.2.6
Yes
No
Yes
No
Yes
No
Yes No
4.3.1
4.3.1
4.3.2
4.3.3
4.3.34.4
4.2.54.2.1c
Lower level KCs
are required to
control higher level
KCs
KC definition from
Customer
Develop AQS
control plan when
KC is defined
Perform variation
reduction activity
on KCs
Variation control
techniques
documented
SPC method
used ?
Ensure process
remains
statistically stable
and capable
Current and
representative
data used for SPC
Appropriate control
limits used
Process
orientation
used?
Assure
traceability and
valid part
groupings
In
Control
?
Investigate and
remove (or
minimize) special
causes
Establish process
capability for KCs
Consider
acceptance of KC
based on SPC
KCs Capable?
Identify and
control sources of
variation
4.2.2
KC identified
as part of
project (4.2.1b)
Note: Numbers on process steps
correspond to paragraph numbers
in D6-82479, Addendum 1
A key characteristic is
identified in design
Look to next
opportunity
Figure 2.4
Process Flow for Reducing Variation
in Key Characteristics