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However , effective utilisation of such methods to rework parts in process has yet to be demonstrated.This study investigates the use of spatially resolved acoustic spectroscopy ( SRAS ) scan data to inform repair strategies within a commercial selective laser melting machine .
 process, be, investigates, spectroscopy, data, selective laser melting, machine
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, be, investigates, spectroscopy, data, selective laser melting, machine