Bonnie is a software tool that allows eCQM developers to test and verify the behavior of their eCQM logic. The Bonnie Fast Healthcare Interoperability Resources (FHIR) application allows measure developers to load FHIR measures they have constructed using the Measure Authoring Tool (MAT), which helps measure developers execute the measure logic against the constructed patient test deck, and evaluates whether the logic aligns with the intent of the measure.