Ahmadi, Kosari, and Malaek Figure 4. Aircraft sizing using design plane technique flow graph. Due to the necessity of compliance between physical structure and grouping of the system DPs [15], the DPs should be categorized in to three groups: C The DPs of Information; C The DPs of Energy; C The DPs of Matter. C The other DPs should depend on these parameters; They should be the output of sizing and input to the next phase. So, the inventor of "airplane sizing method using the design plane technique" has selected the following MDPs among the others: They should have the strongest effect on performance; FEBRUARY 2018 They should be independent of each other; C So, it can be concluded that the airplane DPs in compliance with the grouping of its constituent elements are set in to three groups of Information, Energy, and Matter. Then the MDPs must be one parameter of Information, one parameter of Energy, and one parameter of Matter. These three parameters should have the following features: C C C S from the DPs of Information category; C T or P from the DPs of Energy category; C WTO from the DPs of Matter category. Although none of the airplane designers did not mention in their publications but it seems that the principle of "Grouping the DPs based on the physical structure" has been observed in their work. IEEE A&E SYSTEMS MAGAZINE 37