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Key learnings from each cycle of designing , building and testing have been used as inputs for the next iteration , to finally end up with a design and the associated requirements upon which the further development process will be based .
 process characterization: testing; material: as; engineering feature: design; concept or principle: process; material: be
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:
 process characterization: testing; material: as; engineering feature: design; concept or principle: process; material: be