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In terms of validation , the effectiveness of the proposed control mechanism and the implemented controller was investigated through both simulative studies and real-life experiments .
 concept or principle: validation; concept or principle: effectiveness; concept or principle: mechanism; machine or equipment: controller
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: validation; concept or principle: effectiveness; concept or principle: mechanism; machine or equipment: controller