A method of correlating reactor criticality conditions through the use of a parameter that is an index of the spectral-flux distribution. The method was previously applied to correlate the criticality conditions for a series of bare reactors containing various moderators and considered a range of moderator-to-U235 mole ratios. This memorandum extends the method to a reactor that contains a resonance absorber in addition to a moderator and U235. The method is applied to the results of a 53-group analysis of a series of reactors composed of U238, U235, and H20 in various mole ratios. Good correlation is obtained, and the use of the method for predicting the influence of other resonance absorbers on criticality is indicated.