4. The method of claim 1 also including generating a results table including a results row for each test column, each results row indicating an output that will be generated given the input values of the test column.
4. The method of claim 1 also including generating a results table including a results row for each test column, each results row indicating an output that will be generated given the input values of the test column. 6. The method of claim 4 also including, in response to a user interaction with a results row, indicating which row of the rule specification will generate the output in that results row.