THIS EVALUATION TECHNIQUE DISCRIMINATES BETWEEN ALTERNATIVE POSSIBLE CAUSES OF A CERTAIN EFFECT OR OUTCOME. THE MODUS OPERANDI OF A PARTICULAR CAUSE IS AN ASSOCIATED CONFIGURATION OF EVENTS, PROCESSES, OR PROPERTIES, USUALLY IN TIME SEQUENCE, WHICH CAN OFTEN BE DESCRIBED AS THE 'CHARACTERISTIC CAUSAL CHAIN' CONNECTING THE CAUSE WITH THE EFFECT. THE TOTAL SEQUENCE OF MO ANALYSIS, INFERENCES BEING, OF COURSE, PROBABILISTIC, IS AS FOLLOWS: ONE, CHECK FOR THE PRESENCE OF EACH POSSIBLE CAUSE; IF ONLY ONE, THAT IS THE CAUSE. TWO, IF MORE THAN ONE IS PRESENT, CHECK FOR COMPLETE MO'S; IF NONE, THEN NONE OF THOSE POSSIBLE CAUSES WAS A CAUSE; THREE, IF ONLY ONE MO IS COMPLETE, THE POSSIBLE CAUSE WITH WHICH THAT MO IS ASSOCIATED IS THE CAUSE. IF MORE THAN ONE COMPLETE MO IS PRESENT, THE ASSOCIATED FACTORS ARE CO-CAUSES....ELW