“…However, others have had difficulty replicating this finding using alternate assessment methods in a CBT-oriented intervention (Kelly, Roberts & Ciesla, 2005). Further, as previously stated, sudden gains have been found to occur across several treatment modalities (Tang & DeRubeis, 1999b;Tang et al, 2002Tang et al, , 2005Stiles et al, 2005;Andrusyna et al, 2006) and among samples who are not receiving active treatment (Kelly et al, 2007;Vittengl et al 2003). This suggests that the precipitants and meaning of sudden gains in the remediation of depressive symptoms have yet to be fully understood.…”