Arriving at a final design is normally a subjective process that can require a number of iterations.

Ezigrade simplifies the design process and is completely interactive. In the example below we wish to change the section shape's. Click on the node between the sections as shown. A green grip box appears. Click in the box and move. All the sections are modified appropriately automatically. Click on any other nodes as necessary. Even add in some new links and add in new sections as necessary.

Repeat grading step - compare results. Keep going until satisfied with the answer.