Despite the importance of psychotherapy interventions for older adults with MDD there is limited access to these treatments for seniors. At present, nurse case managers and social work case managers (CM) do not receive formal training in problem solving therapy. Since they often provide treatment for geriatric mental health outpatients, this limits access to treatments like PST. However, if CM's have formal training in PST, this treatment option can be made available to seniors that could benefit from such programs. To the best of the investigators' knowledge no study has evaluated the effects of CM trained to deliver PST for individuals with LLD in Canada, as such, this is the aim of the current investigation.