With Waterfall, a team consists of analysts, designers, testers and documentation specialists.
With Scrum, each team member is empowered and expected
to self-manage themselves and to participate in all duties needed to deliver the set of work
they have collectively committed to complete within a sprint.
Scrum teams develop a deep form of camaraderie and a feeling that "we're all in this together."
A typical Scrum team is 6-10 people but Jeff Sutherland has scaled Scrum up to over 500 people
and I have used it with over 50.
The primary way of scaling Scrum to work with large teams is to coordinate a "Scrum of Scrums."
With this approach each Scrum team proceeds as normal but each team also contributes one person
who attends Scrum of Scrum meetings to coordinate the work of multiple Scrum teams.
These meetings are analogous to the Daily Scrum, but do not necessarily happen every day.
In many organizations, having a Scrum of Scrums meeting two or three times a week is sufficient.
The illustration below shows how a Scrum of Scrums approach allows Scrum to scale up
(in this case to 243 people). Each cell represents one person on a Scrum team.
The bottom of this illustration shows teams with nine developers on them.
One person from each team (the differently colored cell) also participates in a Scrum of Scrum
to coordinate work above that team. Then from those nine-person teams another person is selected
(this time shown with diagonal lines) to participate in what might be called a Scrum of
Scrums of Scrums.
We would like to suggest you the following list of usefull resources on the topic: