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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 .
 concept or principle: Process optimization; concept or principle: step; manufacturing process: metal additive manufacturing; manufacturing process: AM; concept or principle: processes; concept or principle: quantitative; concept or principle: process parameters; application: mechanical; machine or equipment: component
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: Process optimization, step, metal additive manufacturing, AM, processes, quantitative, process parameters, mechanical, component 
Answer:
 concept or principle: Process optimization; concept or principle: step; manufacturing process: metal additive manufacturing; manufacturing process: AM; concept or principle: processes; concept or principle: quantitative; concept or principle: process parameters; application: mechanical; machine or equipment: component