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Process optimization has always been a crucial step for effective usage of metal additive manufacturing ( AM ) processes : it consists in establishing quantitative relations between final part 's characteristics and process parameters to find their optimal combination and obtain a fully functional mechanical component .
 Process optimization, step, metal additive manufacturing, AM, processes, quantitative, process parameters, mechanical, component
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:
 Process optimization, step, metal additive manufacturing, AM, processes, quantitative, process parameters, mechanical, component