Revision policy Current versus concurrent adjustment (I/II) "Extreme" approach -min. technical revisions − Concurrent adjustment: Re-identification of model, filters and outliers and re-estimation of parameters and components every time new or revised data become available Reasonable compromise − Partial concurrent adjustment: Re-identification once a year, re-estimation every time new or revised data become available "Extreme" approach -precision − Current adjustment: Re-identification and

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... stimation once a year (revision period) and usage of forecasted components in the meantime SAUG (Rome),