Hello, The estimate field for a work item is a field that is derived from the work item's planned hours and the team's hours per point value (found in team settings). So, there are 8 planned hours on an issue and the hours per point value is set to 8, then the estimate will be 1. Because this is a derived field and not an actual field in the system, you cannot filter on it. However, in your scenario, you might be able to simply filter on planned hours being equal to 0, since those work items should also have an estimate of 0. Jake Turpin Workfront