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Description of work-in-progress design candidates during the pre-concept and conceptual aircraft design stages have traditionally followed protocol compatible with the later, more mature phases of contemporary product development, i.e. preliminary and detailed design. Up to this moment in time there has been a natural, intuitive tendency to approach design description using geometry as the initial basis upon which all analysis and design refinement could proceed. Design and integration, whether kinematic or structural (static) systems, and irrespective of applications, should be treated as a holistic problem with functionality as opposed to geometric description of a physically tangible artifact being the first step in product definition. This paper presents a coherent, logical method of describing an aircraft concept using functionality as a basis.