Deleting an activity from a learning journey is permanent, and it affects everyone in the journey — not just new participants or one group. Before you delete a micro-training, assignment, survey, or any other activity, it's worth knowing exactly what goes with it.
What deleting an activity does
When you delete an activity, it's removed for everyone in the learning journey, including people who already received and completed it — they lose access to it in their journey. The engagement and results collected for it go with it, and they can't be recovered. Knowly warns that Deletion can't be undone.
The one thing deletion doesn't reach is a notification that already went out: an email or text already in someone's inbox isn't recalled. But the activity itself, and everything in it, disappears from every participant's journey.
Less destructive alternatives
If you don't actually want to erase the activity and the data it has collected, you usually don't need to delete it:
To stop it from being sent, clear the activity's schedule instead of deleting it. The activity and anything it has already collected stay in place, and you can schedule it again later. See Cancelling scheduled activities.
To control what newly added participants receive, choose how much of the journey they get when you add them, rather than deleting activities so they miss them. See Adding a participant after launch.
To take a finished journey out of your active list, archive it — that keeps its history, engagement, and results. See Archiving a learning journey.
To remove one person's data from the results, remove that participant instead of the activity. See Removing data from results.