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Tighter controls on processing temperature during layer melting to lower process temperature and selective heating during in situ heat treatment to reduce over-sintering are proposed as methods for improving the process .
 process parameter: temperature; process parameter: layer; concept or principle: process; manufacturing process: heating; concept or principle: in situ; manufacturing process: heat treatment; material: as; concept or principle: process
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: temperature, layer, process, heating, in situ, heat treatment, as, process 
Answer:
 process parameter: temperature; process parameter: layer; concept or principle: process; manufacturing process: heating; concept or principle: in situ; manufacturing process: heat treatment; material: as; concept or principle: process