This brief describes how the UI-FHS project introduced a data review process and an Excel tool (IDTT) for triangulating immunization program data and vaccine supply data to improve data quality and programmatic decision-making in Ethiopia. Specifically, the tool triangulates data from DHIS2, where immunization data is reported, with data from the mBrana logistics management information system to produce rations that provide insight into potential issues, such as the over-reporting of administered doses. In addition to detailing how the tool works and the data review process, the brief describes some of the benefits and challenges of IDTT.