Systems, methods, and other embodiments associated with history and scenario data tracking are described. In one embodiment, a method includes receiving a request for trending analysis on project data. The request includes a trend range and a time basis. An item table associated with the time basis is selected. The item table includes a record for each time increment of the time basis. Each respective record in the item table includes an effective time for the respective time increment. The method further includes selecting a set of records in the item table that fall within the trend range; and generating a snapshot of the project data for each effective time in each respective selected record in the item table. The generated snapshots of project data are returned in response to the request for trending analysis.