Article deals with different concepts of decision making, which may be used for aggregation of the acquired knowledge, as well as with the use of specific physical values. Making of a correct decision may result in the use of the specific methodology or also synthesis of the already existing methodology. My objective is to use the process of synthesis, which is based on mathematics-oriented methodology. It would be much easier to design new products, using the newly acquired methodology, as well as to improve the existing methodology.