This dissertation examines third-party public reporting on healthcare quality in Ontario, Canada. Through a mixed-methods study, the researcher assessed current public reporting and identified opportunities to improve its effectiveness for quality improvement. The quantitative analysis found performance improved for one-third of publicly reported measures. Where reporting was combined with other accountability mechanisms, greater improvement was seen. However, there is insufficient evidence public reporting alone improves quality. Qualitative interviews with key informants identified ways to strengthen reporting's impact, such as bundling it with incentives. In conclusion, public reporting can be effective when combined with other improvement strategies.