Table 1.
The L9 (34) orthogonal design
| Test number | Column number | |||
|---|---|---|---|---|
| A | B | C | D | |
| T1 | 1 | 1 | 1 | 1 |
| T2 | 1 | 2 | 2 | 2 |
| T3 | 1 | 3 | 3 | 3 |
| T4 | 2 | 1 | 2 | 3 |
| T5 | 2 | 2 | 3 | 1 |
| T6 | 2 | 3 | 1 | 2 |
| T7 | 3 | 1 | 3 | 2 |
| T8 | 3 | 2 | 1 | 3 |
| T9 | 3 | 3 | 2 | 1 |
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