1. A computer-implemented method, comprising: performing by one or more computers: storing item description information for a plurality of items offered for sale in an electronic marketplace, wherein the item description information for each item includes a plurality of attributes descriptive of that item; subsequent to providing a submitter with given item description information for a given item offered for sale in the electronic marketplace, receiving a correction submission specified by the submitter, the correction submission specifying a proposed modification to one or more of the plurality of attributes in the given item's item description information; generating a risk score for the correction submission based on a measure of the proposed modification's significance with respect to changing said given item description information; and in response to determining that the risk score meets one or more risk criteria and also determining that the submitter has been approved such that correction submissions that are submitted by that particular submitter and have a risk score meeting said risk criteria are exempt from a separate review process: performing the proposed modification on the given item description information to update that item description information within the electronic marketplace.