One of the most important concepts in 3D CAD modeling is the concept of Parametric Design. In Parametric Design, you do not used constant values for dimensions, but you use variables. Then you have a table where you put all the variable values. Good parametric design technique allows you to create 3D objects which are very easy to edit, and very easy to adapt to new applications. In this tutorial we will show you how to develop good parametric design habits. We take you through a design example step-by step to show you how its done. Enjoy!