Francis D.K Ching explains how architecture and building construction are not really the samething. Architecture should be considered the following conceptual system of order in addition to the physical construction  Ching mentions on page 2.02. Building control is only the execution of architecture. He also talks about system which is an assembly of interrelated or independent part forming a more complex and unified whole and serving a common purpose. Some systems he mentioned were structural system, Enclosed system, and mechanical system. Each system had its on functional way of importance. Ching explains and shows drawings that defines its way of form.