Figure 1.
Conventional representation (a) of a four-quadrant decision table. Each column is a rule so column 3 may be read: IF Symptom is Present AND Physical finding is Absent AND Lab Result is Positive THEN Perform Treatment 1. Determination (b) of the completeness of a decision table rule set. The product of the moduli—eight—equals the sum of the column counts and all combinations of decision variables are unique.