Evenness is the difference between the percentage of a minority group in a particular part of a city, compared to the city as a whole. Exposure is the likelihood that a minority and a majority party will come in contact with one another. Clustering is the gathering of different minority groups into a single space; clustering often leads to one big ghetto and the formation of hyperghettoization. Centralization measures the tendency of members of a minority group to be located in the middle of an urban area, often computed as a percentage of a minority group living in the middle of a city (as opposed to the outlying areas). Concentration is the dimension that relates to the actual amount of land a minority lives on within its particular city. The higher segregation is within that particular area, the smaller the amount of land a minority group will control.