The multi-dimensional core functions can be classified using different top-level classes of the classification (e.g. 'health issues', 'methods'), and instances (see Figure  7 ). For example, the function or purpose of core function two (shaded in Table 5 ) is to 'Prevent and control communicable and non-communicable diseases and injuries' using the public health intervention methods of 'risk factor reduction, education, screening, immunisation and other interventions'. 