Does ethics depend on the situation?

I suppose it does depend upon the situation of the matter. how can you make an ethical judgment without considering the situation itself.

Joseph Fletcher was a main contributer within situation ethics as I studies during my A levels and as he believed, you can only judge by concluding the consequences. I rememeber an example used (A very minor exapmle, but nevertheless it works)...

"If you saw an old lady being mugged not far from you, and you believed you could help her, would going across the grass with a sign saying 'DO NOT WALK ON GRASS' be wrong if it meant being the quickest possible way of getting to her aid?"

so basically, doing a minor wrong action can help for a greater good. It is strongly based on looking out for anothers well being even if it means doing something that you shouldn't, or wouldn't normally do.

Also look into utilitarianism, which in summary is doing the action which creates the greatest amount of happiness for the greatest number of people. All these theories suggest that Ethics is judged by a situation :)

I hope this helps!