A Scrum Master does not have to be there; he or she only has to ensure the Development Team has a Daily Scrum. The Scrum Master enforces the rule that only Development Team members participate in the Daily Scrum. Although the Scrum Master or Product Owner can attend this meeting to facilitate the Daily Scrum, this is certainly not required by Scrum. The Development Team members synchronize their work, monitor their progress toward the Sprint Goal and if required they adapt the Sprint Backlog and the plan for the next 24 hours during the Daily Scrum.