Table 2.

A possible classification of populated areas primarily on a residential population density and geographical basis. If monitoring data are disaggregated on this basis it will make them more meaningful to provider organizations, will tend to separate different types of provision technology and problems, and will facilitate international research categories.

urban	1	capital city (excl. 3,4.)
	2	big cities (excl. 3,4.)
	3	centre urban slums
	4	peri-urban slums
	5	towns
rural	6	settlements
	7	dispersed
	8	specialized/other