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The actual validation of the programs is performed on the basis of different sample geometries with varying wall thickness and deformation characteristic.While both simulation approaches , AAP and AAS , are capable of predicting the qualitative characteristics of the residual deformations sufficiently well , accurate quantitative results are difficult to obtain .
 concept or principle: validation; concept or principle: sample; concept or principle: geometries; engineering feature: wall thickness; concept or principle: deformation; enabling technology: simulation; concept or principle: qualitative; concept or principle: residual deformations; process characterization: accurate
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: sample; concept or principle: geometries; engineering feature: wall thickness; concept or principle: deformation; enabling technology: simulation; concept or principle: qualitative; concept or principle: residual deformations; process characterization: accurate