The article examines the role of patients’ changing expectations about treatment outcomes in psychotherapy for depression. It shows that not only baseline expectations (before treatment starts) but also the within-person change in expectations over time independently predict treatment success. In a study of 75 patients undergoing 16 sessions of psychotherapy, greater increases in outcome expectancy were linked to faster and more substantial symptom improvement. The findings suggest that dynamic expectancy is a key factor in recovery and could serve both as an indicator of treatment progress and as a therapeutic target itself.