Core function four 'Promote, develop and support healthy public policy, including legislation, regulation and fiscal measures' requires special mention, as it is shown as relevant to all the functions of the public health classification. It is proposed that public policy measures are methods to address all functions rather than a function in their own right. 'Public policy development' is thus shown as a separate method in Table 6 , as is 'legislation and regulation' (which some see as enacted policy). Public health activity using these methods can have a major impact on population health. Examples include the impact on population smoking rates of legislation, regulations, and fiscal measures implemented under the policy umbrella of the Tobacco Control Strategy.