- preliminary process capability studies
- preliminary process capability studies
Preliminary Process Capability Studies are short term studies conducted to obtain early
information on the performance of new or revised processes relative to internal or customer
requirements. In many cases, preliminary studies should be conducted at several points in the
evolution of new processes (e.g., at the equipment or tooling subcontractor's plant, after
installation at the supplier's plant) These studies should be based on as many measurements
as possible. When X Bar and R charts, at least twenty subgroups (typically three to five pieces)
are required to obtain sufficient data for decision making. When this amount of data is not
available, control charts should be started with whatever data is available.
Source: www.adamssixsigma.com
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