LiteSpeed Maintenance Plan have constraints that join the various tasks. What's the difference between "Success" and "Completion"?
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Precedence Constraints (the arrows between tasks in the Control Flow) tell LiteSpeed the order in which to run tasks.
They also tell LiteSpeed under what conditions to pass control between the tasks.
The default constraint is a "success" constraint, which means that Task "B" will only run if Task "A" completes successfully.
But you can also modify the constraint so that "B" runs if "A" fails, or "B" runs when "A" completes - whether it fails or succeeds.
In this sense, "Success" and "Failure" are included in the "Completion" condition.