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DTM.6:3 - Forces
| Force | Tension |
|---|
| Simple separate models are tractable | Their independence can remove the relation that controls the outcome. |
| A familiar interaction model is available | Its resource, response or contact assumptions may not hold here. |
| Co-occurrence supplies evidence | Shared conditions can produce it without interaction. |
| Intervention changes one variant | It may also change the intermediary and the other variant’s conditions. |