Milestone: Quality gate
At the quality gate, a decision must be taken either to continue or to repeat the phase.
Main Description

At a quality gate, which is not shown in the given figures, immediately following the task “Verify and Validate” the results of the verification and validation are checked. And a decision must be taken either to continue or to repeat the phase. At this point one can decide whether and if so how to repeat the phase. For example, sometimes it would only be necessary to repeat a specific or a number of tasks, rather than all tasks in the phase.

Properties
Predecessor
Multiple Occurrences
Event Driven
Ongoing
Optional
PlannedYes
Repeatable
Required Results