“…Despite the low levels at baseline, after the PLD, several variables increased significantly, including teacher's perceived knowledge, confidence, and usefulness related classroom behavior support practices. Although we are unable to make a causal inference between the PLD and improvement in scores, these results are similar to other PLD studies (e.g., Hirsch et al, 2020;Lane et al, 2015). In our study, there were significant differences between participants' perceived knowledge, confidence, usefulness, and actual knowledge scores before and after the PLD (see Table 2).…”