SPC統計過程控製(英文版)(ppt 23頁)

SPC統計過程控製內容摘要：
Statistical Process Control
Variability exists in everything - people, machines and nature
Purpose - to be sure that processes are performing in an acceptable manner
monitor over time
forecast if will still be well in future
determine factors that make it out of control
History
Prior to IR craftsmen were responsible for entire process - pride of workmanship
During 1920’s W. Shewart of Bell Labs build Control Charts - ASQ formed
During 1950’s Deming introduced QC techniques to Japanese
1961 Feigenbaum wrote Total Quality Control
Statistical Process Control
Two main subjects
Acceptance Sampling - test random samples of finished goods and accept or reject whole lot
Process Control - sample process output at different points in time - see if process is in control - determine cause of out-of-control behavior

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