The purpose of this statistical bulletin is to provide analysis of the latest annual data collections relating to teacher vacancies, teacher sickness absence (excluding voluntary grammar) and teacher substitution (excluding voluntary grammar) in grant-aided schools in 2016/17. This information is analysed by former Education and Library Board areas, school type and management type. The information collected throughout this process is used by policy branches within the Department of Education to inform education workforce policy. The data are also used to respond to Assembly questions. All figures referred to are included in the main body of the text. All tables are included as annexes.