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. 1997 Sep-Oct;4(5):382–393. doi: 10.1136/jamia.1997.0040382

Figure 1.

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.