“…As researchers ultimately interested in improving student learning, then, it is our charge to determine which contexts, sources, use patterns, and features of supplementation tend to be "good" and which tend to be "bad." Existing research has found that supplements from large online marketplaces tend to be of low academic quality (Hertel and Wessman-Enziger, 2017;Polikoff and Dean, 2019;Sawyer et al, 2019;Sawyer et al, 2020b), sometimes promote racist or sexist ideas (Hu et al, 2019;Rodriguez et al, 2020;Shelton et al, 2020), and may nudge teachers to view students more as human capital to be produced than as humans to be educated (Attick, 2017;Pittard, 2017;Bartell et al, 2019). Very little research exists that focuses on teachers' supplement use patterns, so while we can speculate as to the possible value of some of the use patterns we outline, this study was designed to be exploratory, not evaluative, in nature.…”