Essential Science Indicators^SM from Thomson Scientific contains data on Research Fronts (see Research Front Methodology) which are updated every two months. As part of this bimonthly processing, ScienceWatch.com selects the largest Research Fronts in each of the 22 major fields covered by Essential Science Indicators. The largest fronts are determined by the number of core papers they contain.

For details on the number of core papers and other statistical characteristics of each Front, see the Research Fronts section of Essential Science Indicators.