Abstract
Working with 3D space through the 2D computer screen is a skill that has to be mastered by CAD users. Current user interface designs fail to address the basic issue of relating the users' mental space with the computer's construction space. VISUALCAD, a new technique developed to communicate 3D CAD concepts, combines the users' mental space and the computers construction space. Through the use of video tools it enables us to discuss and demonstrate the key concepts in CAD all in one real space. The use of video is found to be an indispensable part of CAD training.
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