The calibration process consists of a number of steps: 1 populating the database with independently identified regional events; 2 developing regional boundaries and pre-identifying severe regional phase blockage zones; 3 measuring and calibrating coda based magnitude scales; 4a measuring regional amplitudes and making magnitude and distance amplitude corrections MDAC ; 4b applying the DOE modified kriging methodology to MDAC results using the regionalized background model; 5 determining the thresholds of detectability of regional phases as a function of phase type and frequency; 6 evaluating regional phase discriminant performance both singly and in combination; 7 combining steps to create a calibrated discrimination surface for each stations; 8 assessing progress and iterating. We have now developed this calibration procedure to the point where it is fairly straightforward to apply earthquake-explosion discrimination in regions with ample empirical data. Several of the steps outlined above are discussed in greater detail in other DOE papers in this volume or in recent publications. Here we emphasize the results of the above process: station correction surfaces and their improvement to discrimination results compared with simpler calibration methods.