1. A system comprising: a first collection of information stored in accordance with a reporting data model; a second collection of information setting forth a collection of one or more additive delta records, the additive delta records each including a numeric value that characterizes the magnitude of a change to a numeric measure in the first collection, wherein the numeric measure is no longer current, and identification information that identifies the numeric measure in the first collection; and an analytic engine to perform queries on the first collection of information and the second collection of information to yield an aggregated result set that is based on the contents of both the first collection of information and the second collection of information.