“…Specifically, both the effectiveness (as measured by value added) and instructional performance (as measured by inservice performance evaluations) of cooperating teachers have been found to be associated with the future effectiveness and instructional performance of their teacher candidates who themselves become teachers (Bastian et al, 2020; Goldhaber et al, 2020b; Matsko et al, 2020; Ronfeldt, Brockman, & Campbell, 2018; Ronfeldt, Matsko, et al, 2020). Three recent experimental studies build on this observational work by providing evidence that candidates randomly assigned to “better” student teacher placements (as proxied by cooperating teacher experience and value added and school value added) report better preparedness (Ronfeldt, Goldhaber, et al, 2018; Ronfeldt, Bardelli,et al, 2020) and receive better preservice clinical observation ratings (Goldhaber, Ronfeldt, Matsko et al, 2020) than candidates randomly assigned to “worse” placements.…”