In this set of tutorials we'll use parameters to create dynamic blocks in order to add windows to our elevation drawing. We'll get started by creating some blocks of a few window types from our design. We'll learn how to work with parameters and actions in order to create a flexible block. We'll apply stretch parameters as well a list of multiple sizes for future projects. By the end of this course you'll have an understanding of how parameters work and you should be very comfortable with applying the stretch parameter and action. So with that I'm ready to started and I'll see you in the next lesson.