The California Next Generation Science Standards (CA NGSS)--adopted in 2013--have the potential to improve scientific literacy and strengthen the global competitiveness of California's workforce. However, longstanding underinvestment in science education and the unprecedented disruptions caused by COVID-19 have heightened challenges faced by California's districts, schools, and students. In the full report, the authors use data from multiple sources to understand the impact of COVID-19 on science education when schools were mainly virtual. The following technical appendices accompany the full report: (1) Data, sample and, methodology; (2) Additional tables and figures; (3) Survey instruments; and (4) Interview protocols. [For the full report "The Impact of COVID-19 on Science Education: Early Evidence from California," see ED623554. For "The Impact of COVID-19 on Science Education. Policy Brief," see ED623555.]