The systematic collection and analysis of appraisal results may, furthermore, provide information at a system-level for the further development of policies to strengthen leadership in schools. An increasing number of countries conducts appraisal to provide feedback and to inform professional development. In many of these cases, appraisal may lead to summative consequences for underperforming school leaders if a school leader fails to improve after an unsatisfactory rating and the introduction of an improvement plan, for example. The ways in which results are used may differ depending on a school leader’s performance in the appraisal as well as the school level and school type.