The dimensional variations inherent in a manufacturing process are the reason for the existence of the acceptance tolerance concept on a product characteristic. The geometric quotation system has many advantages over the Cartesian system by avoiding ambiguity in the interpretation on form, orientation and location errors. The two main standards that define the geometric quotation on a mechanical design are ISO1101/2012 and ASME Y14.5-2009. However there are differences in interpretation even when the same symbols are mentioned by these standards. It is, therefore, important to know these differences to ensure the quality for companies that provide products to customers who apply different standards of geometric control. This article presents the results of perpendicularity control using each standard and their difference as an example of the impact when choosing one of them. In addition, the article shows preliminary results of a still on-going survey indicating that these differences between the standards are still little known among professionals in the areas involved in Brazil.