Building practices have to rely on drawings. Before the advent of Computer-Aided Design (CAD), the drawings were produced manually through hand drawing with traditionally drawing boards. It was a very time consuming, tedious and even frustrating way, especially when the buildings were complex.
In late 20th century, many CAD software have been developed to aid the drafting process with which the 2D and 3D drawings were generated more efficient and flexible over hand drawing. With the advantages of CAD tools1, the drafting process was easier and less time consuming thus helped the productivity to increase to some extent.
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