Background The Australian Bureau of Statistics (ABS) estimates that 5.8% of the adult Australian population has depression each year and that depression the leading contributor to the non- fatal disease burden in Australia (1). Depression is both prevalent and disabling with a substantial impact on employee well-being and performance. Additionally the majority of symptomatic individuals do not seek professional treatment within the previous 12- months(1), yet treatments are highly effective. The societal cost of depression in Australia is largely unknown, but is potentially very significant. It not only includes the direct costs of treatment but also the indirect costs including lost productivity, both while at work(2-8) and days absent from work(5;8-14). It is increasingly evident that a decrement in productivity while at work, rather than absence from work, is the principal factor contributing to overall decreased worker productivity. Depression can have the first onset at any age however; highest prevalence for females is in the early to mid 20's whist for males it is in mid-to-late 30's(15;16). This is when people are in the workforce. Many people with depression may not attribute their symptoms to depression, or may be reluctant to seek treatment. Due to the high prevalence of mood disorders, the low treatment seeking behaviour and the disabling nature of these disorders it has been recognised that health policy makers need to develop better programs aimed at increasing the numbers of people seeking treatment and to improve the inclusion and retention of employees. From a humanitarian perspective the evidence supporting the need to facilitate treatment in individuals with mental health disorders is compelling. However, if even 60% of persons with a mood or anxiety disorder were to seek medical or psychological treatment, this would completely overwhelm the available psychological services infrastructure and government expenditure resources. Thus, new and innovative methods of mental health service delivery are required. One possible mental health service delivery method is for employers to screen employees for mental health symptoms and then provide employer funded treatment. For such a program to be widely accepted by employers a couple of key pieces of information are required which are (1) how widespread is the problem? (2) how much are we loosing in productivity? (3) where do I target resources? and (4) what is the return on investment for providing mental health services? The WORC Project aims are to identify employees with symptoms of depression, who are not in treatment for their symptoms then, using cognitive behavioural therapy (CBT) and motivational interviewing techniques to encourage these employees to seek advice from a mental health professional. This project will not only identify the economic burden that depression has on employers and the nation but also determine the return on investment for early identification and treatment for depression.