ZWCAD software, as a highly reliable and powerful CAD tool, meets the needs of 2D/3D design & drafting industry, including architecture, engineering, construction (AEC), mechanics, electronics... and anyone who creates CAD drawings. The stability of ZWCAD 2009 has been greatly improved with strict debugging using an automated test system. More than 20,000 drawings are employed for stability testing. Overall performance is improved with the increased processing speed of a large number of crucial functions, such as RefEdit, Insert, Pasteclip, Explode, Regen, Stretch, Trim and Extend. ZWCAD 2009 adds jogged dimensions and arc length dimensions, in addition to improving dimensions overall. Dimension styles are created and modified with the dimension style manager.