1. What is the action?  You may need some knowledge of science to even understand what the various possiblities for action are.

2. What are the effects of the action?

3. How do those effects relate to the fulfillment/frustration of various value judgements?

4. How do various value judgements relate to each other?   Do they contradict one another in principle, as applied, or not at al?

Science and reason are necessary for all four of those questions.