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Type of interaction between different factors.
| Criterion | Interaction type |
|---|---|
| q(X1 ∩ X2) < Min(q(X1) ,q(X2)) | Nonlinear weakening |
| Min(q(X1),q(X2)) < q(X1 ∩ X2) < Max(q(X1),q( X2)) | Single-factor nonlinear weakening |
| q(X1 ∩ X2) > Max(q(X1),q( X2)) | Bifactor enhancement |
| q(X1 ∩ X2) = q(X1) + q(X2) | Independent |
| q(X1 ∩ X2) > q(X1) + q(X2) | Nonlinear enhancement |
