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If your organisation is large, it is usual yo update your reader groups using an export from a centralised administration system export - such as a data file produced by SIMS in a primary school. Using the import reader facilities, it is then possible to selectively just update the class / tutor group rather than modify the entire reader record.
Sometimes however, possibly influenced by personal preference or very small numbers, or even a gradual update that has been presented to you during the year, it may be more efficient to simply move small groups manually (or even the entire organisation, for that matter).