Open the Arezzo Composer. When you first access this area from the Study Definition module, the plan for the study is displayed in the middle window.
Click on a task to display its handles. See image
Click on the centre handle and drag your mouse to another task to draw a line. See image This line is called a 'constraint line'. It acts like a 'one-way street' between two tasks. For example, if two eForms are linked by a constraint line, the first must be completed before the second one can be opened.
To remove a link, right click on it and select Remove Scheduling Link from the context-sensitive menu.