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The link is now this one: Pause Leads in an Engagement Program - Marketo Docs - Product Docs
I like to create a stream called "Success" or "Completed". I then have external workflows that set criteria to move people into those buckets. For example, if I'm nurturing someone and suddenly they make a purchase I move them into the Success stream. If they disqualify for any reason I put them in Completed.
This way I can better understand what's happened to people in my Nurture and if I need to put them back into a Nurture I don't start them from scratch.