Many architectural drawings are created in CAD software programmes that can produce images at any format and size. The decision of what size to render these images at will be determined to their printed format, which is in turn governed by where and how the work will be presented.
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Larger formats (such as A0, A1 and A2 sheets) are useful for presentation drawings for an exhibition or public examination. The smaller A3 and A4 formats are quicker and cheaper to produce, but they are limited in the amount of information that they can communicate; there is only so much content that can be contained on these sheet sizes.