For example, if a 3D model and drawing of this component were created while designing the spark plug and minor changes were made to that part, the 3D model should automatically change its size to adapt to the general trend. Bidirectional associativity then makes changes to the component from drawing mode by altering the dimensions presented on the drawing, causing the component's 3D extruded model to update. It is an extremely useful feature that allows you to adjust the size of the components at each stage of modeling, without the need to apply patches in the others