Estimation of the state of a product property based on similarity of its parameters

The value i.e. state / level of a quality of a product is done by states of its properties. These are defined during engineering design process. Thus their establishing and determining usually using methods Design for X (DFX) within this starting phase is needed. However many states of properties can be determined exactly with great difficulties (e.g. manufacturing cost, reliability, etc.). In the article the knowledge-based method of estimation prediction of the state of a property of the designed product will be presented. The method is based on the set of known properties of similar products. The method has been verified with use of EXCEL SW and tested on typical examples from industrial practice.