A typical structural plan is used to advance the architect's concept by specifying the shape and position of all structure parts – allowing the structure to be built on-site. Structural drawings are also used to prepare reinforcement drawings. A typical structural plan, also known as an engineering drawing, is a design or set of plans for how a structure or other structure will be constructed. Architectural drawings are used to inform structural drawings, which registered professional structural engineers typically prepare. They are primarily concerned with a structure's load-carrying members.