The "new urban history" emerged in the 1960s as a branch of Social history seeking to understand the "city as process" and, through quantitative methods, to learn more about the inarticulate masses in the cities, as opposed to the mayors and elites. Much of the attention is devoted to individual behavior, and how the intermingling of classes and ethnic groups operated inside a particular city. Smaller cities are much easier to handle when it comes to tracking a sample of individuals over ten or 20 years.