On May 10th, 2020 the Prime Minister announced a phased return of some children to school in England from June 1st. Schools had been closed to all but vulnerable and keyworker children since March 20th, meaning that most children have been educated at home for a period of 10 weeks, and some year groups are not expected to return to school until autumn. The National Foundation for Educational Research (NFER) conducted a national survey of 1,233 senior leaders and 1,821 teachers in publicly funded, mainstream primary and secondary schools in England. This report contains information on sampling and analysis. It is part of a larger research project focusing on schools' responses to COVID-19. [For a related summary report, see "Schools' Responses to COVID-19: Key Findings from the Wave 1 Survey" (ED608586).]