<P> An architectural drawing or architect's drawing is a technical drawing of a building (or building project) that falls within the definition of architecture . Architectural drawings are used by architects and others for a number of purposes: to develop a design idea into a coherent proposal, to communicate ideas and concepts, to convince clients of the merits of a design, to enable a building contractor to construct it, as a record of the completed work, and to make a record of a building that already exists . </P> <P> Architectural drawings are made according to a set of conventions, which include particular views (floor plan, section etc .), sheet sizes, units of measurement and scales, annotation and cross referencing . Conventionally, drawings were made in ink on paper or a similar material, and any copies required had to be laboriously made by hand . The twentieth century saw a shift to drawing on tracing paper, so that mechanical copies could be run off efficiently . </P> <P> The development of the computer had a major impact on the methods used to design and create technical drawings, making manual drawing almost obsolete, and opening up new possibilities of form using organic shapes and complex geometry . Today the vast majority of drawings are created using CAD software . </P> <P> The size of drawings reflects the materials available and the size that is convenient to transport--rolled up or folded, laid out on a table, or pinned up on a wall . The draughting process may impose limitations on the size that is realistically workable . Sizes are determined by a consistent paper size system, according to local usage . Normally the largest paper size used in modern architectural practice is ISO A0 (841 mm × 1,189 mm or 33.1 in × 46.8 in) or in the USA Arch E (762 mm × 1,067 mm or 30 in × 42 in) or Large E size (915 mm × 1,220 mm or 36 in × 48 in). </P>

What is used by architects and engineers to create diagrams and graphical drawings
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