This classification of a public health activity is much better than a one-dimensional classification at answering the questions listed in Box 2 in Section 3.1.3 as a practical test for the classification. For instance, in response to the question 'How much was spent last year on the prevention of obesity?', Figure 8 shows that public health activities for which the function is 'prevention' and the health issue is 'obesity' can 60 AIHW 2004b . 61 AIHW 2004b easily be identified, and the values in the 'expenditure' slot (attribute) for these activities can then be summed.