The American Educator Panels (AEP) are nationally representative samples of teachers, school leaders, and district leaders across the country. In the main report, "Job-Related Stress Threatens the Teacher Supply: Key Findings from the 2021 State of the U.S. Teacher Survey," (ED613590) that accompanies these appendixes, the authors draw on the American Teacher Panel (ATP) to examine teachers' reports of their own well-being and working conditions to understand what factors might influence teachers' intentions to leave their teaching jobs during the coronavirus disease 2019 (COVID-19) pandemic. In these technical appendixes, the authors provide more detail about the data, samples, and methodology. They also present the results of the survey questions referenced in the main report. The survey was administered to 1,006 ATP members in January and February 2021. The following appendices are presented: (1) Methods; (2) ATP Survey Questions and Responses; (3) Survey Questions and Responses from the American Life Panel; and (4) Survey Questions and Responses from the Understanding America Study.