Computer Aided Design (CAD) allows engineers to create detailed part designs with high efficiency and low cost compared to traditional drawing boards. CAD software is used to model designs in both 2D and 3D formats, and can automate tasks like generating drawings, parts lists, and providing new design capabilities. Modern CAD involves creating a central design model that downstream applications in design, analysis, and manufacturing can all utilize. Computer techniques are now closely integrated between modeling designs, analyzing and simulating designs, and generating manufacturing instructions.