A Product Goal can have a big size so that several Scrum Teams have to be build and upscaled until they have the ideal size to fulfill a Product Goal. For scaled Scum Teams Scrum methods as Nexus, Scrum@Scale, LeSS or SaFe are available. There is still one Product Backlog for all Scrum Teams. For any Scrum Team there is one Product Owner as well as one Chief Product Owner for coordination. The Scrum Teams work in parallel on one Product Goal.