Iteration reviews and retrospectives is the correct answer. The effort to identify issues during those times are included in the iteration’s estimate. Because agile methods consider the team’s reasons learned to be too important to be
saved for the end of a project, they are presented at the end of each iteration. The other answers are incorrect because the determination of the special cause variation isn’t an agile task that’s part of the agile project management
approach; problems in the project are not addressed in user stories; to see what’s already happened in the project, trend analysis uses lagging metrics.