Let's talk about Scrum rules. There are only three prescribed roles in Scrum. The first one is a scrum master. It's a dedicated person. The second one is a product owner. It is also dedicated person.

And the third one is the open team development team contains multiple people, but it still needs to be considered as single role or development team role. Let's go through the important facts on Scrum roles. So there is only three roles in Scrum. It's a scrum master. It's a product owner and the open team. Once again, when we are speaking about the open team, we need to consider just a single role, which represent a number of people.

All these three roles creates a meaningful scrum team. So when we are speaking about three roles together Scrum Master product owner and development team, we could call it as scrum team. Development team is a part of scrum team. The normal size of development team usually takes from three to nine members. There are no roles like project manager, tester, QA, business analyst and etc in Scrum. Now let's talk about each Scrum role in details.