Would you mind defining the various roles of a Scrum team?

"There are several different roles on a scrum team. These include the project owner, who has the overall responsibility for keeping the project on schedule and under budget. This person typically interfaces with other project stakeholders outside of the team. The scrum master works with the team to make sure each task is accomplished per the project schedule. They also delegate tasks to each team member and manage the overall workflow of the team. The scrum team members are assigned individual or group tasks and are responsible for completing the work needed to finish the project."