How to Determine What You Intend and What You Don't Intention

It's possible to know that something bad is going to happen as a result of your actions and yet you don't intend for that bad thing to happen. So how can we determine what you intend? And Peter now wears solution to this problem is to appeal to proportionality. He says if you conclude that the overall effect of your action is bad, then it would be imprudent to choose it. The idea behind proportionalism is that when you're considering an action, you have to judge it in light of its consequences.