New Zealand now has its first national picture of teaching and school practices, and principal leadership in English-medium schools. The Teaching and School Practices Survey Tool (TSP) is an online survey tool designed for schools and Kahui Ako to inquire into their teaching, school, and principal leadership practices. The TSP tool was developed in 2017 and made available for use in Terms 2 and 3 of that year. The national picture presented in this report draws on the 2017 aggregated data. The tool was commissioned by the Ministry of Education to provide: (1) school-level data that can be used by schools and Kahui Ako in review and planning to improve teaching and leadership capability; and (2) national data that can be used for evaluating the impact of policy, initially the introduction of Kahui Ako and changes to professional learning and development. The items in the TSP draw on robust research evidence about practices that are linked to desirable student experiences of learning and student outcomes. The items are consistent with The New Zealand Curriculum, ERO's school evaluation indicators, and the Standards for the Teaching Profession.