The World School Leadership Study (WSLS) aims to gain empirical insights into functions, job models, practices, job satisfaction, and the professional health of school leaders on a global scale. The study builds on two pre-studies previously described. The WSLS is designed as a quantitative study on practices and resilience of school leaders. It will feature a strong international comparative component (the common core of the survey) but also allows national add-ons for country specific research needs and interests. At the moment, around 30 countries have decided to participate, including for instance Sweden, Norway, Switzerland, Germany, Austria, England, Spain, Cyprus, South Africa, Hong Kong, Singapore, Thailand, Malaysia, China, Australia, New Zealand, Chile, Mexico, and the US. - There are two levels of coordination. The overall design is coordinated by a core research group in collaboration with members from all around the world that form the international research consortium. On the national level, the study is coordinated and conducted by national coordinators who ally with the respective national and regional bodies to guarantee high acceptance in the profession and, therefore, high response rates. National and regional bodies include governments, authorities as well as school leadership (and teacher) associations and unions, depending on context. Complementing the members of the international core research group and the national coordinators is an international advisory board, comprising well-known senior researchers from different continents. - The study will consist of several phases: • Decision on the focus of the research questions, development of hypothesis, operationalization; • Decision on national add-ons for country specific research needs and interests; • Thorough examination of the existing research instruments by an international panel of experts (this will be done with the aim to identify relevant factors of school leadership practices