If there are more than one workflow Triggers of the same type created for a particular object class , they are executed in the order in which they were created.
To change the execution order of Triggers:
In the Workflow and Business Logic > [Module] > [Object Class] > Workflow > Triggers > [Trigger Type] section, click Order. The Execution Order window opens.
Select each Trigger you want to reorder and use the Move Up and Move Down buttons to change its location.