To assess the effectiveness of CBT (e.g. cognitive therapy, cognitive behavioural therapy, rational emotive behaviour therapy, prolonged grief CBT) compared with non-CBT therapies (e.g. psychodynamic, humanistic, family or systemic therapies) for treating people with bereavement-related MDD or PGD.

To assess the effectiveness of CBT compared with usual care or waiting list for treating people with bereavement-related MDD or PGD.

To assess the effectiveness of CBT compared with pharmacological interventions (e.g. antidepressant medications and other drug therapies used explicitly for treating depressive disorders (Sadock 2009)) for treating people with bereavement-related MDD or PGD.