05-07-2012, 11:12 AM
STATISTICAL PROCESS CONTROL
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DEFINITIONS
Process
Set of activities that uses resources & transform inputs into outputs
Process Control
Actions taken or checks provided to,
Prevent the occurrence of causes of nonconformities
Detect the causes of nonconformities
Detect the occurrence of failure in the process output
Statistics
A science used for collection, organization, presentation, analysis & interpretation of numerical data
Why Statistical Methods
Initial Belief – Acquiring knowledge is a matter of chance
Next Belief – Knowledge is gained through systematic experimentation
Current Belief – Knowledge can be acquired & enhanced through systematic data collection and analysis
To gain knowledge about processes on real time basis
Make economically sound decisions
Balancing between over control & under control
VARIABILITY
Data in general,fluctuates because of changes in Process Inputs
Material Differences
Equipment Differences
Human Performance Differences
Power Fluctuation
Etc.