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You can specify if a task is optional or mandatory and whether or not the task must be completed before moving off the step, or moving to some step in the future.  This way you can be sure that everything that must be done on a step is always done.  

Setting Due Dates

Due dates for default tasks need to be set relative to real dates in the actions.  Because you don't know this ahead of time you need to set the due dates a certain number of days before or after either the date that the step was reached in the actual action or relative to a custom date defined for that action type. We'll get to custom data late, so for this tutorial you will be setting the due dates relative to the step change date.

Enough Theory - Let's get into it!