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Different from a traditional trial-and-error method in AJP , the proposed printing quality optimization approach is developed based on the principles of statistical modeling , analysis of variance and global optimization .
 trial-and-error, quality optimization, modeling, optimization
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:
 trial-and-error, quality optimization, modeling, optimization