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Experimental investigation techniques are usually employed for this purpose but they can be extremely expensive and time-consuming , especially when the output of the process depends on a large number of parameters , like for AM .
 Experimental, be, process, parameters, AM
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:
 Experimental, be, process, parameters, AM