This article presents the new format of ONS revision articles and describes on a consistent basis how constant price GDP quarterly growth estimates change from the first estimate to the final official growth estimate. The article attempts to distinguish between revisions due to new data, which are unbiased in early stages, and revisions mainly due to methodological changes, which we would expect to be positive. Initial results are presented for the period 1993 to 1998, and show that overall the mean revision is plus 0.19 per cent. Of this, 0.008 per cent arises between month one and month three estimates, and 0.088 per cent arises from mainly long run methodological changes.
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