There are three types of models available in microstation Design Model A design model is a collection of elements that are drawn for creation of desired model. The design model is drawn to actual size. A design model can be a 2D or a 3D model. You can create it by clicking the Create Model icon in the Models dialog and selecting the Type setting as Design or Design from Seed. In the design model, you can create the design of your project such as a building, bridge, road etc. Design model typically has a black background. Drawing Model A drawing model is an optional intermediate stage between the 3D design and sheet model. The drawing model is a 2D model in which you reference a design at full scale to add annotations, dimensions, callouts and other embellishments. It typically has a gray background. Sheet Model A sheet model contains design model references that are scaled and positioned to create a printable drawing. It can be considered as an electronic drawing sheet. Sheet mo