…posttraining and follow-up was moderate in size after self-study instruction (mean d = −0.57; Martino et al., 2011; Miller et al., 2004; Moyers et al., 2008; Sholomskas et al., 2005) and after didactic workshop training (mean d = −0.55; Baer et al., 2004; Miller et al., 2004; Moyers et al., 2008).