Background The prevalence of depression is high and the elderly have an increased risk of developing a chronic course. International data suggest that depression in the elderly is under-recognised, the latency before clinicians provide a treatment plan is longer, and elderly patients with depression are not offered psychotherapy to the same degree as younger patients. Although recommendations for the treatment of elderly patients with depression exist, health care professionals adhere to these recommendations to a limited degree only. Investigators conducted a systematic review to identify recommendations for managing depression in the elderly and prioritised six recommendations. Investigators identified and prioritised determinants of practice related to implementation of these recommendations in primary care, and subsequently discussed and prioritised interventions to address the identified determinants. The objective of this study is to evaluate the effectiveness of these tailored implementation interventions to implement six recommendations for the management of elderly patients with depression in primary care.