Structure Chart in VAW

Open VAW and create a Structure Chart

File => New Diagram

Diagram Type => Structure Chart

Click Module tab to create modules and then click Invocation tab to connect modules

要畫double couple時，先滑鼠點選single arrow上。

move the mouse to the arrow and click the mouse again
如果double couple要表示output(由下往上的箭頭)，在single arrow下方的三角形再按一下，就會出現double couple並跳出對話框，輸入output的內容後按OK即可。
如果double couple要表示input(由上往下的箭頭)，在single arrow上方的小正方形再按一下，就會出現double couple並跳出對話框，輸入input的內容後按OK即可。

Make single arrow into decision arrow

There are two ways to draw Conditional Invocations. First, we can click on Conditional Invocation and draw a arrow with conditional.

However, if we draw a single arrow at first and then we still edit it into conditional invocation.

click on the single arrow => right-click => Terminator type => choose Decision => click ok

and then the single arrow changes into conditional invocation