“…Lambert et al (2003) and Shimokawa, Lambert, and Smart (2010) found much larger effects of feedback on outcome compared to no feedback, ranging between .28 and .70, but their meta-and mega-analyses included only studies from their own research group and were mainly conducted in the university counselling centre. More recent trials, both inside and outside Lambert's group, have shown more moderate but consistent effects of feedback (Bickman, Douglas Kelley, Breda, De Andrade, & Riemer, 2011;Byrne, Hooke, Newnham, & Page, 2012;Newnham, Hooke, & Page, 2010;Reese, Norsworthy, & Rowlands, 2009;Simon et al, 2013;Simon, Lambert, Harris, Busath, & Vazquez, 2012).…”