Table 1.

Usability Evaluation on Representative Tasks

Function	Needs consultation to complete function	Ability to repeat func- tion
1. Load Document	yes: 1; no: 4	yes: 5
2. Create Instance	yes: 0; no: 5	yes: 5
3. Delete Instance	yes: 0; no: 5	yes: 5
4. Create Relation	yes: 1; no: 4	yes: 5
5. Delete Relation	yes: 0; no: 5	yes: 5
6. Annotate Relation	yes: 3; no: 2	yes: 5
7. Save Annotation	yes: 1; no: 4	yes: 5
8. Automatic Named En- tity Recognition	yes: 0; no: 5	yes: 5