It is important to note that QTO is needed during several phases of the design and construction process, with differing requirements and available information. ![]() This is mainly due to lack of modeling conventions, agreed workflows, and classification, together with modeling errors like overlapping structural elements and limitations of BIM software. According to literature, the accurate, automated calculation of formwork areas from BIM remains still problematic. ![]() Therefore, the use of BIM for QTO is increasing. ![]() However, obtaining accurate QTOs from 2D traditional drawings is tedious and time-consuming. Quantity take-off (QTO) is an indispensable part of construction projects since it is used for scheduling and cost calculation.
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