The study is conducted in five haemophilia treatment centres (HTCs) from different geographical regions (Algeria, India, Iran, Malaysia and South Africa) that maintain a local or national haemophilia registry. Data will be collected from 20 randomly selected, active patient records from each participating registry/country. In countries with national registries, data from local registries will not be permitted for inclusion to allow adequate assessment of the possibility of registry harmonisation across various regions. Participating centres will report data as available in the data source without seeking additional information to fill source data gaps at the time of data collection. In addition, each investigator will complete a basic questionnaire on feasibility parameters to confirm the source and accuracy of the data, as well as challenges experienced during data collection. Analysed parameters will be grouped into three categories: sociodemographic, disease, and treatment and disease outcome parameters. Feasibility assessment will be performed for all study variables and the percentage availability of each study variable recorded in the participating registries wii be determined, as well as the proportion of missing data for existing variables.