Definition :
The Scrum of Scrums is a scaling system. Scrum scales fractally and by doing as such confines the quantity of correspondence pathways transmit information relevant to the success of the enterprise . The Scrum of Scrums is practically equivalent to the group level Daily Scrum with the exception of the Scrum of Scrums is a virtual team made out of delegates from various individual Scrum groups that work together to coordinate and ship a product(s).
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Further Reading:
Lean Agile Software Development by Alan Salloway, Guy Beaver and James R. Trott.