| Blackboard | Unit Space | Unit Class | Slot-Variables |
| 1.DOE | Orthogonal-arrays | Orthogonal-array | 1.OA-name
2.Levels 3.Max-factors 4.Total-number-of-dv |
| 2.Defined model | Element types | Type-name | 1.Element-name |
| 3.Variable | 1. Parameters | 1. Defined parameter | 1. Variable-name
2. Relation-list 3. Initial-level-value 4. Description |
| 2.Defined material | 1. Material-no
2. Material-name 3. Property -value | ||
| 3. Design parameter | 1. Variable-name
2. Level-value 3. Description | ||
| 4. Design material | 1. Material-name
2. Material-no 3. Material-as-level 4. Property-name 5. Level-value | ||
| 2. Objective | Function | 1. Variable-name
2. Type 3. Description |