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The objective of this paper is to develop a statistical process control ( SPC ) approach to detect process changes as soon as it occurs based on predefined distribution of the monitoring statistics .
 statistical process control, SPC, process, as, as, distribution, statistics
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 statistical process control, SPC, process, as, as, distribution, statistics