13
Methods for early cost estimation are lacking , while current figures for production cost per cm3 are not based on established calculation methods and lack experimental and industrial verification .
 concept or principle: cost estimation; concept or principle: production cost; concept or principle: experimental; application: industrial
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: cost estimation; concept or principle: production cost; concept or principle: experimental; application: industrial