Hi holliedays,
documented means information that's been writen down and can be used by others as a guide or to inform what they do.
Outcomes for children are what individuals, groups and the wider society collectively want to see its young people being able to have.
The EYFS & development matters both contain written/documented outcomes/statements about development that it hopes children will achieve. ECM also lists 5 positive outcomes that it wants everyone to have & know about.
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