After the Sprint Review meeting took place the Scrum Team and the Scrum Master get together for the Sprint Retrospective. In this meeting all team members reflect on the past sprint and check three things: what went well during the sprint, what didn't, and what improvements could be made in the next sprint. The meeting should be time-boxed (e.g. 3 hours).
The Sprint Retrospective is an integral part of the “inspect and adapt” process. Without this meeting the team will never be able to improve their overall output and cannot focus on the overall team performance. Therefore actionable suggestions to improve performance should be available at the end of the meeting.