Definition :
LeSS Huge builds on the LeSS framework by optimizing for eight or more teams. Conceptually is it LeSS scaled up further by having multiple (smaller) LeSS frameworks stacked on top of each other. As a result, LeSS Huge introduces several new concepts and challenges for managing large-scale backlogs. These are requirement areas, area product backlogs, and area product owners.
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Further Reading:
Large Scale-Scrum by Craig Larman and Bas Vodde.