From the list of questions used for the military in the United States:
Is a vital national security interest threatened?
Do we have a clear attainable objective?
Have the risks and costs been fully and frankly analyzed?
Have all other non-violent policy means been fully exhausted?
Is there a plausible exit strategy to avoid endless entanglement?
Have the consequences of our action been fully considered?
Is the action supported by the American people?
Do we have genuine broad international support?