Assertive Community Treatment (ACT) refers to a loosely related set of principles and practices focused on improving the lot of those identified as 'heavy service users', or those people who have historically been difficult to engage in treatment. A burgeoning body of research testifies to the effectiveness of ACT and a bewildering number of acronyms such as PACT, MIT, MCT, TCL and MST have been coined to describe services more or less faithful to ACT principles. This paper describes the key principles of ACT, research on outcomes and ACT programmes, presents a sketch of the Mobile Intensive Treatment Team in Townsville and critiques ACT from an ethical perspective. It proposes that ACT ought to commence from a philosophy of community mental health firmly grounded in respect for people, and ought to be the primary business of community mental health services.