This article introduces the special series on maintenance of gains fol
lowing psychosocial interventions. The special series covers specific,
prevalent disorders-unipolar depression, substance abuse, obesity, an
d conduct disorders-and treatments that have shown positive outcomes f
or follow-up periods as long as 1 year. The focus is on longer term ma
intenance, where much less is known. Promising strategies proposed in
this series to extend treatment effects are highlighted, as are resear
ch strategies that have broad application across disorders.