These are the allowed Links. If you need more explanation check the iStar 2.0 Guide
| Both of the elements are inside the same actor (or actors are not used) |
| Link Type |
From |
To |
| Refinement (and, or) |
Goal |
Goal |
| Goal |
Task |
| Task |
Goal |
| Task |
Task |
| |
|
|
| Contribution (Make, Help, Hurt, Break) |
Soft Goal |
Soft Goal |
| Goal |
Soft Goal |
| Resource |
Soft Goal |
| Task |
Soft Goal |
| |
|
|
| Qualification |
Soft Goal |
Goal |
| Soft Goal |
Task |
| Soft Goal |
Resource |
| |
|
|
| Needed-By |
Resource |
Task |
| |
|
|
| One element is inside an actor, one element is outside an actor |
| Link Type |
From |
To |
| depends |
Any Element |
Any Element |
| Links between actors |
| is-a, participates-in |
Actor |
Actor |