Waterfall – American model, comes literally from the word “waterfall” and the word accurately describes the processes of performing tasks in the project. The next step is implemented only when the previous one is completely completed.
Scrum Master is one of the three roles in the Scrum team. He cares for all parties and strives to preserve the order, rules and principles of Scrum. Scrum is a way of working that strives to maintain sustainable productivity for the teams and the product produced to be of high value.