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According to the hierarchical principle, the EAs should fit perfectly to the boundaries as outlined in the hierarchy, to allow aggregation of data per geographic level. The determination of size is influenced mainly by the EAs\u2019 geographical location and population density. In sparsely populated areas, the EAs tend to be large in terms of area but have a low dwelling unit (DU) count of approximately 100, whereas the densely populated areas tend to have small area sizes with a dwelling (DU) count of approximately 151. The EAs can be linked to various census variables according to users\u2019 needs, which make it a powerful layer for manipulating and analysing socio-economic and demographic data within a spatial context. The EA demarcation process was mostly a manual process due to errors caused by missing data and non-standardisation of national base data sets that were used as input or reference data, which made the design and development of automated processes very difficult. 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