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It is in the logic of the rule. For example, if you have Workflow Rule B that checks a box if the date changes, it won't work if the date is indirectly changed by another task. If you create a Workflow Rule A that changes dates and this box is checked, it will treat it as a direct versus indirect change and will be able to trigger Workflow Rule B. There is a limit of how many rules you can chain in this way, and there is no direct link that you code into the rule A.