The specification is the written half of the design: what materials must be, how work is done and checked, and how it is measured and paid. Drawings say where and how big; the specification says what and how well.
Every drawing set has a written partner. On a building it is usually called the specification; on a highway job it may be the project's special provisions sitting on top of an agency's standard specifications. It is long, dense and essential: most of what decides quality and cost is written there, not drawn.
Whatever the system, a section answers the same questions:
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